diff --git a/quic/core/chlo_extractor.cc b/quic/core/chlo_extractor.cc
index b2d11e0..4ce5d8c 100644
--- a/quic/core/chlo_extractor.cc
+++ b/quic/core/chlo_extractor.cc
@@ -52,7 +52,6 @@
   bool OnPingFrame(const QuicPingFrame& frame) override;
   bool OnRstStreamFrame(const QuicRstStreamFrame& frame) override;
   bool OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) override;
-  bool OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) override;
   bool OnNewConnectionIdFrame(const QuicNewConnectionIdFrame& frame) override;
   bool OnRetireConnectionIdFrame(
       const QuicRetireConnectionIdFrame& frame) override;
@@ -211,11 +210,6 @@
   return true;
 }
 
-bool ChloFramerVisitor::OnApplicationCloseFrame(
-    const QuicConnectionCloseFrame& frame) {
-  return true;
-}
-
 bool ChloFramerVisitor::OnStopSendingFrame(const QuicStopSendingFrame& frame) {
   return true;
 }
diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index efc89d3..cb901ba 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -1261,15 +1261,6 @@
   return connected_;
 }
 
-bool QuicConnection::OnApplicationCloseFrame(
-    const QuicConnectionCloseFrame& frame) {
-  // TODO(fkastenholz): Need to figure out what the right thing is to do with
-  // this when we get one. Most likely, the correct action is to mimic the
-  // OnConnectionCloseFrame actions, with possibly an indication to the
-  // application of the ApplicationClose information.
-  return true;
-}
-
 bool QuicConnection::OnStopSendingFrame(const QuicStopSendingFrame& frame) {
   DCHECK(connected_);
 
@@ -3053,6 +3044,8 @@
   }
   QuicConnectionCloseFrame* frame =
       new QuicConnectionCloseFrame(error, details);
+  // If version99/IETF QUIC set the close type. Default close type is Google
+  // QUIC.
   if (transport_version() == QUIC_VERSION_99) {
     frame->close_type = IETF_QUIC_TRANSPORT_CONNECTION_CLOSE;
   }
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index d13458d..c921d1b 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -250,13 +250,11 @@
   // Called when a RstStreamFrame has been parsed.
   virtual void OnRstStreamFrame(const QuicRstStreamFrame& frame) {}
 
-  // Called when a ConnectionCloseFrame has been parsed.
+  // Called when a ConnectionCloseFrame has been parsed. All forms
+  // of CONNECTION CLOSE are handled, Google QUIC, IETF QUIC
+  // CONNECTION CLOSE/Transport and IETF QUIC CONNECTION CLOSE/Application
   virtual void OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) {}
 
-  // Called when an IETF QUIC CONNECTION_CLOSE/Application Frame has been
-  // parsed.
-  virtual void OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) {}
-
   // Called when a WindowUpdate has been parsed.
   virtual void OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame,
                                    const QuicTime& receive_time) {}
@@ -498,7 +496,6 @@
   bool OnPingFrame(const QuicPingFrame& frame) override;
   bool OnRstStreamFrame(const QuicRstStreamFrame& frame) override;
   bool OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) override;
-  bool OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) override;
   bool OnStopSendingFrame(const QuicStopSendingFrame& frame) override;
   bool OnPathChallengeFrame(const QuicPathChallengeFrame& frame) override;
   bool OnPathResponseFrame(const QuicPathResponseFrame& frame) override;
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 4072ecd..56b0453 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -1368,6 +1368,8 @@
 
     QuicConnectionCloseFrame qccf(QUIC_PEER_GOING_AWAY);
     if (peer_framer_.transport_version() == QUIC_VERSION_99) {
+      // Default close-type is Google QUIC. If doing IETF/V99 then
+      // set close type to be IETF CC/T.
       qccf.close_type = IETF_QUIC_TRANSPORT_CONNECTION_CLOSE;
     }
 
@@ -7233,6 +7235,8 @@
 
   QuicConnectionCloseFrame qccf(QUIC_PEER_GOING_AWAY);
   if (peer_framer_.transport_version() == QUIC_VERSION_99) {
+    // Default close-type is Google QUIC. If doing IETF/V99 then
+    // set close type to be IETF CC/T.
     qccf.close_type = IETF_QUIC_TRANSPORT_CONNECTION_CLOSE;
   }
 
diff --git a/quic/core/quic_dispatcher.cc b/quic/core/quic_dispatcher.cc
index 57924ca..75b3c30 100644
--- a/quic/core/quic_dispatcher.cc
+++ b/quic/core/quic_dispatcher.cc
@@ -920,12 +920,6 @@
   return false;
 }
 
-bool QuicDispatcher::OnApplicationCloseFrame(
-    const QuicConnectionCloseFrame& /*frame*/) {
-  DCHECK(false);
-  return false;
-}
-
 bool QuicDispatcher::OnMaxStreamIdFrame(const QuicMaxStreamIdFrame& frame) {
   return true;
 }
diff --git a/quic/core/quic_dispatcher.h b/quic/core/quic_dispatcher.h
index 62b7ebb..a6d7e37 100644
--- a/quic/core/quic_dispatcher.h
+++ b/quic/core/quic_dispatcher.h
@@ -165,7 +165,6 @@
   bool OnPingFrame(const QuicPingFrame& frame) override;
   bool OnRstStreamFrame(const QuicRstStreamFrame& frame) override;
   bool OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) override;
-  bool OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) override;
   bool OnStopSendingFrame(const QuicStopSendingFrame& frame) override;
   bool OnPathChallengeFrame(const QuicPathChallengeFrame& frame) override;
   bool OnPathResponseFrame(const QuicPathResponseFrame& frame) override;
diff --git a/quic/core/quic_error_codes.cc b/quic/core/quic_error_codes.cc
index a5bef73..e2a14ad 100644
--- a/quic/core/quic_error_codes.cc
+++ b/quic/core/quic_error_codes.cc
@@ -135,7 +135,6 @@
     RETURN_STRING_LITERAL(QUIC_STREAM_LENGTH_OVERFLOW);
     RETURN_STRING_LITERAL(QUIC_CONNECTION_MIGRATION_DISABLED_BY_CONFIG);
     RETURN_STRING_LITERAL(QUIC_CONNECTION_MIGRATION_INTERNAL_ERROR);
-    RETURN_STRING_LITERAL(QUIC_INVALID_APPLICATION_CLOSE_DATA);
     RETURN_STRING_LITERAL(QUIC_INVALID_MAX_DATA_FRAME_DATA);
     RETURN_STRING_LITERAL(QUIC_INVALID_MAX_STREAM_DATA_FRAME_DATA);
     RETURN_STRING_LITERAL(QUIC_INVALID_STREAM_BLOCKED_DATA);
diff --git a/quic/core/quic_error_codes.h b/quic/core/quic_error_codes.h
index 2004a08..b06cc7f 100644
--- a/quic/core/quic_error_codes.h
+++ b/quic/core/quic_error_codes.h
@@ -286,8 +286,6 @@
 
   // Receive a RST_STREAM with offset larger than kMaxStreamLength.
   QUIC_STREAM_LENGTH_OVERFLOW = 98,
-  // APPLICATION_CLOSE frame data is malformed.
-  QUIC_INVALID_APPLICATION_CLOSE_DATA = 101,
   // Received a MAX DATA frame with errors.
   QUIC_INVALID_MAX_DATA_FRAME_DATA = 102,
   // Received a MAX STREAM DATA frame with errors.
diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index 0e30453..583291e 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -2915,10 +2915,15 @@
           }
           break;
         }
+        case IETF_APPLICATION_CLOSE:
         case IETF_CONNECTION_CLOSE: {
           QuicConnectionCloseFrame frame;
           if (!ProcessIetfConnectionCloseFrame(
-                  reader, IETF_QUIC_TRANSPORT_CONNECTION_CLOSE, &frame)) {
+                  reader,
+                  (frame_type == IETF_CONNECTION_CLOSE)
+                      ? IETF_QUIC_TRANSPORT_CONNECTION_CLOSE
+                      : IETF_QUIC_APPLICATION_CONNECTION_CLOSE,
+                  &frame)) {
             return RaiseError(QUIC_INVALID_CONNECTION_CLOSE_DATA);
           }
           if (!visitor_->OnConnectionCloseFrame(frame)) {
@@ -2928,19 +2933,6 @@
           }
           break;
         }
-        case IETF_APPLICATION_CLOSE: {
-          QuicConnectionCloseFrame frame;
-          if (!ProcessIetfConnectionCloseFrame(
-                  reader, IETF_QUIC_APPLICATION_CONNECTION_CLOSE, &frame)) {
-            return RaiseError(QUIC_INVALID_APPLICATION_CLOSE_DATA);
-          }
-          if (!visitor_->OnApplicationCloseFrame(frame)) {
-            QUIC_DVLOG(1) << "Visitor asked to stop further processing.";
-            // Returning true since there was no parsing error.
-            return true;
-          }
-          break;
-        }
         case IETF_MAX_DATA: {
           QuicWindowUpdateFrame frame;
           if (!ProcessMaxDataFrame(reader, &frame)) {
diff --git a/quic/core/quic_framer.h b/quic/core/quic_framer.h
index 8d2fd93..90ef998 100644
--- a/quic/core/quic_framer.h
+++ b/quic/core/quic_framer.h
@@ -154,17 +154,10 @@
   // Called when a RstStreamFrame has been parsed.
   virtual bool OnRstStreamFrame(const QuicRstStreamFrame& frame) = 0;
 
-  // Called when a ConnectionCloseFrame has been parsed.
+  // Called when a ConnectionCloseFrame, of any type, has been parsed.
   virtual bool OnConnectionCloseFrame(
       const QuicConnectionCloseFrame& frame) = 0;
 
-  // Called when an IETF QUIC CONNECTION_CLOSE/Application Frame has been
-  // parsed. TEMPORARILY pass the frame as a QuicConnectionCloseFrame.
-  // TODO(fkastenholz): remove when V99 fully utilizes the IETF
-  // CONNECTION_CLOSE close frame.
-  virtual bool OnApplicationCloseFrame(
-      const QuicConnectionCloseFrame& frame) = 0;
-
   // Called when a StopSendingFrame has been parsed.
   virtual bool OnStopSendingFrame(const QuicStopSendingFrame& frame) = 0;
 
diff --git a/quic/core/quic_framer_test.cc b/quic/core/quic_framer_test.cc
index 4cb837e..2ffe54e 100644
--- a/quic/core/quic_framer_test.cc
+++ b/quic/core/quic_framer_test.cc
@@ -315,15 +315,6 @@
     return true;
   }
 
-  // TODO(fkastenholz): Remove when IETF QUIC is completely converted to
-  // doing Connection Close.
-  bool OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) override {
-    // OnApplicationCloseFrame receives a QuicConnectionCloseFrame as part of
-    // migration to IETF QUIC's new model.
-    connection_close_frame_ = frame;
-    return true;
-  }
-
   bool OnStopSendingFrame(const QuicStopSendingFrame& frame) override {
     stop_sending_frame_ = frame;
     return true;
@@ -4452,6 +4443,7 @@
   CheckFramingBoundaries(fragments, QUIC_INVALID_CONNECTION_CLOSE_DATA);
 }
 
+// Test the CONNECTION_CLOSE/Application variant.
 TEST_P(QuicFramerTest, ApplicationCloseFrame) {
   if (framer_.transport_version() != QUIC_VERSION_99) {
     // This frame does not exist in versions other than 99.
@@ -4509,7 +4501,7 @@
 
   ASSERT_EQ(0u, visitor_.ack_frames_.size());
 
-  CheckFramingBoundaries(packet99, QUIC_INVALID_APPLICATION_CLOSE_DATA);
+  CheckFramingBoundaries(packet99, QUIC_INVALID_CONNECTION_CLOSE_DATA);
 }
 
 TEST_P(QuicFramerTest, GoAwayFrame) {
diff --git a/quic/core/quic_ietf_framer_test.cc b/quic/core/quic_ietf_framer_test.cc
index 987bce9..b0c0125 100644
--- a/quic/core/quic_ietf_framer_test.cc
+++ b/quic/core/quic_ietf_framer_test.cc
@@ -155,12 +155,6 @@
     return true;
   }
 
-  // TODO(fkastenholz): remove when finishing conversion to new IETF QUIC
-  // model.
-  bool OnApplicationCloseFrame(const QuicConnectionCloseFrame& frame) override {
-    return true;
-  }
-
   bool OnStopSendingFrame(const QuicStopSendingFrame& frame) override {
     return true;
   }
diff --git a/quic/core/quic_types.h b/quic/core/quic_types.h
index f90b0fa..e3a40cf 100644
--- a/quic/core/quic_types.h
+++ b/quic/core/quic_types.h
@@ -254,8 +254,7 @@
   IETF_PATH_RESPONSE = 0x1b,
   // Both of the following are "Connection Close" frames,
   // the first signals transport-layer errors, the second application-layer
-  // errors.The frame formats and protocol procedures are the same, the only
-  // difference is the number space in the frame's error code field.
+  // errors.
   IETF_CONNECTION_CLOSE = 0x1c,
   IETF_APPLICATION_CLOSE = 0x1d,