Refactor QuicFramer::Get...ConnectionCloseFrameSize

This CL refactors QUicFramer::Get...ConnectionCloseFrameSize in
preparation for a following CL to add in additional IETF QUIC
CLOSE_CONNECTION functionality.

gfe-relnote: Not flag protected, refactor existing method.
PiperOrigin-RevId: 247005149
Change-Id: Ibb339a6e16f9f16c842cdbc2026563c25f93e44e
diff --git a/quic/core/quic_framer_test.cc b/quic/core/quic_framer_test.cc
index 0b5dca5..ddf8076 100644
--- a/quic/core/quic_framer_test.cc
+++ b/quic/core/quic_framer_test.cc
@@ -11558,9 +11558,8 @@
     connection_close.close_type = IETF_QUIC_TRANSPORT_CONNECTION_CLOSE;
   }
 
-  EXPECT_EQ(QuicFramer::GetMinConnectionCloseFrameSize(
-                framer_.transport_version(), connection_close) +
-                256,
+  EXPECT_EQ(QuicFramer::GetConnectionCloseFrameSize(framer_.transport_version(),
+                                                    connection_close),
             QuicFramer::GetRetransmittableControlFrameSize(
                 framer_.transport_version(), QuicFrame(&connection_close)));