diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index d43b680..ac953ba 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -8,12 +8,12 @@
 #include <sstream>
 #include <string>
 
+#include "absl/base/attributes.h"
 #include "net/third_party/quiche/src/quic/core/congestion_control/rtt_stats.h"
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
 #include "net/third_party/quiche/src/quic/core/quic_time.h"
 #include "net/third_party/quiche/src/quic/core/quic_time_accumulator.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
@@ -734,7 +734,7 @@
       if (is_round_start) {
         recovery_state_ = GROWTH;
       }
-      QUIC_FALLTHROUGH_INTENDED;
+      ABSL_FALLTHROUGH_INTENDED;
 
     case GROWTH:
       // Exit recovery if appropriate.
diff --git a/quic/core/congestion_control/send_algorithm_interface.cc b/quic/core/congestion_control/send_algorithm_interface.cc
index 9d003c5..4b36e4a 100644
--- a/quic/core/congestion_control/send_algorithm_interface.cc
+++ b/quic/core/congestion_control/send_algorithm_interface.cc
@@ -4,12 +4,12 @@
 
 #include "net/third_party/quiche/src/quic/core/congestion_control/send_algorithm_interface.h"
 
+#include "absl/base/attributes.h"
 #include "net/third_party/quiche/src/quic/core/congestion_control/bbr2_sender.h"
 #include "net/third_party/quiche/src/quic/core/congestion_control/bbr_sender.h"
 #include "net/third_party/quiche/src/quic/core/congestion_control/tcp_cubic_sender_bytes.h"
 #include "net/third_party/quiche/src/quic/core/quic_packets.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_pcc_sender.h"
@@ -46,7 +46,7 @@
               : nullptr);
     case kPCC:
       // PCC is work has stalled, fall back to CUBIC instead.
-      QUIC_FALLTHROUGH_INTENDED;
+      ABSL_FALLTHROUGH_INTENDED;
     case kCubicBytes:
       return new TcpCubicSenderBytes(
           clock, rtt_stats, false /* don't use Reno */,
diff --git a/quic/core/crypto/crypto_framer.cc b/quic/core/crypto/crypto_framer.cc
index a1a66c1..2a3f795 100644
--- a/quic/core/crypto/crypto_framer.cc
+++ b/quic/core/crypto/crypto_framer.cc
@@ -7,12 +7,12 @@
 #include <string>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "absl/strings/string_view.h"
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
 #include "net/third_party/quiche/src/quic/core/quic_data_reader.h"
 #include "net/third_party/quiche/src/quic/core/quic_data_writer.h"
 #include "net/third_party/quiche/src/quic/core/quic_packets.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/common/platform/api/quiche_str_cat.h"
 #include "net/third_party/quiche/src/common/quiche_endian.h"
@@ -258,7 +258,7 @@
       reader.ReadTag(&message_tag);
       message_.set_tag(message_tag);
       state_ = STATE_READING_NUM_ENTRIES;
-      QUIC_FALLTHROUGH_INTENDED;
+      ABSL_FALLTHROUGH_INTENDED;
     case STATE_READING_NUM_ENTRIES:
       if (reader.BytesRemaining() < kNumEntriesSize + sizeof(uint16_t)) {
         break;
@@ -274,7 +274,7 @@
       tags_and_lengths_.reserve(num_entries_);
       state_ = STATE_READING_TAGS_AND_LENGTHS;
       values_len_ = 0;
-      QUIC_FALLTHROUGH_INTENDED;
+      ABSL_FALLTHROUGH_INTENDED;
     case STATE_READING_TAGS_AND_LENGTHS: {
       if (reader.BytesRemaining() <
           num_entries_ * (kQuicTagSize + kCryptoEndOffsetSize)) {
@@ -308,7 +308,7 @@
       }
       values_len_ = last_end_offset;
       state_ = STATE_READING_VALUES;
-      QUIC_FALLTHROUGH_INTENDED;
+      ABSL_FALLTHROUGH_INTENDED;
     }
     case STATE_READING_VALUES:
       if (reader.BytesRemaining() < values_len_) {
diff --git a/quic/core/crypto/quic_crypto_server_config.cc b/quic/core/crypto/quic_crypto_server_config.cc
index e463d24..42379ad 100644
--- a/quic/core/crypto/quic_crypto_server_config.cc
+++ b/quic/core/crypto/quic_crypto_server_config.cc
@@ -10,6 +10,7 @@
 #include <string>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "absl/strings/string_view.h"
 #include "third_party/boringssl/src/include/openssl/sha.h"
 #include "third_party/boringssl/src/include/openssl/ssl.h"
@@ -41,7 +42,6 @@
 #include "net/third_party/quiche/src/quic/core/quic_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_cert_utils.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_hostname_utils.h"
diff --git a/quic/core/http/http_decoder.cc b/quic/core/http/http_decoder.cc
index 066592f..ab21d34 100644
--- a/quic/core/http/http_decoder.cc
+++ b/quic/core/http/http_decoder.cc
@@ -6,6 +6,7 @@
 
 #include <cstdint>
 
+#include "absl/base/attributes.h"
 #include "absl/strings/string_view.h"
 #include "net/third_party/quiche/src/http2/http2_constants.h"
 #include "net/third_party/quiche/src/quic/core/http/http_frames.h"
@@ -13,7 +14,6 @@
 #include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
 #include "net/third_party/quiche/src/quic/core/quic_types.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 
 namespace quic {
diff --git a/quic/core/http/quic_spdy_session.cc b/quic/core/http/quic_spdy_session.cc
index ac05d0f..8658f8e 100644
--- a/quic/core/http/quic_spdy_session.cc
+++ b/quic/core/http/quic_spdy_session.cc
@@ -10,6 +10,7 @@
 #include <string>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "absl/strings/string_view.h"
 #include "net/third_party/quiche/src/quic/core/http/http_constants.h"
 #include "net/third_party/quiche/src/quic/core/http/quic_headers_stream.h"
@@ -19,7 +20,6 @@
 #include "net/third_party/quiche/src/quic/core/quic_versions.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_exported_stats.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
@@ -1046,11 +1046,11 @@
         break;
       }
       case spdy::SETTINGS_ENABLE_PUSH:
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case spdy::SETTINGS_MAX_CONCURRENT_STREAMS:
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case spdy::SETTINGS_INITIAL_WINDOW_SIZE:
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case spdy::SETTINGS_MAX_FRAME_SIZE:
         if (reject_spdy_settings_) {
           CloseConnectionWithDetails(
diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index bd80cf3..f461937 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -11,6 +11,7 @@
 #include <string>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "absl/base/macros.h"
 #include "absl/strings/string_view.h"
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_framer.h"
@@ -39,7 +40,6 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_aligned.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_client_stats.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
@@ -945,7 +945,7 @@
         break;
       case MTU_DISCOVERY_FRAME:
         // MTU discovery frames are serialized as ping frames.
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case PING_FRAME:
         // Ping has no payload.
         break;
@@ -1091,7 +1091,7 @@
         return 0;
       case MTU_DISCOVERY_FRAME:
         // MTU discovery frames are serialized as ping frames.
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case PING_FRAME:
         // Ping has no payload.
         break;
@@ -3004,7 +3004,7 @@
         continue;
       }
       case IETF_EXTENSION_MESSAGE_NO_LENGTH:
-        QUIC_FALLTHROUGH_INTENDED;
+        ABSL_FALLTHROUGH_INTENDED;
       case IETF_EXTENSION_MESSAGE: {
         QuicMessageFrame message_frame;
         if (!ProcessMessageFrame(reader,
@@ -3351,7 +3351,7 @@
           break;
         }
         case IETF_EXTENSION_MESSAGE_NO_LENGTH_V99:
-          QUIC_FALLTHROUGH_INTENDED;
+          ABSL_FALLTHROUGH_INTENDED;
         case IETF_EXTENSION_MESSAGE_V99: {
           QuicMessageFrame message_frame;
           if (!ProcessMessageFrame(
diff --git a/quic/platform/api/quic_fallthrough.h b/quic/platform/api/quic_fallthrough.h
deleted file mode 100644
index 499b61a..0000000
--- a/quic/platform/api/quic_fallthrough.h
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2018 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef QUICHE_QUIC_PLATFORM_API_QUIC_FALLTHROUGH_H_
-#define QUICHE_QUIC_PLATFORM_API_QUIC_FALLTHROUGH_H_
-
-#include "net/quic/platform/impl/quic_fallthrough_impl.h"
-
-#define QUIC_FALLTHROUGH_INTENDED QUIC_FALLTHROUGH_INTENDED_IMPL
-
-#endif  // QUICHE_QUIC_PLATFORM_API_QUIC_FALLTHROUGH_H_
diff --git a/quic/qbone/platform/netlink.cc b/quic/qbone/platform/netlink.cc
index 719551d..d19c28b 100644
--- a/quic/qbone/platform/netlink.cc
+++ b/quic/qbone/platform/netlink.cc
@@ -7,8 +7,8 @@
 #include <linux/fib_rules.h>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "net/third_party/quiche/src/quic/core/crypto/quic_random.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_fallthrough.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_ip_address.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/quic/platform/impl/quic_ip_address_impl.h"
@@ -259,7 +259,7 @@
 
       switch (interface_address->ifa_family) {
         case AF_INET:
-          QUIC_FALLTHROUGH_INTENDED;
+          ABSL_FALLTHROUGH_INTENDED;
         case AF_INET6:
           // QuicIpAddress knows how to parse ip from raw bytes as long as they
           // are in network byte order.