Deprecate FLAGS_quic_reloadable_flag_quic_remove_multipath_bit.

net/quic/core/quic_framer.cc

Index: net/quic/core/quic_framer.cc
diff --git a/net/quic/core/quic_framer.cc b/net/quic/core/quic_framer.cc
index 7404ebb1624bac5d7c36c8e05ea834d5be008a8a..84337191eb72a27daa26fa9f736fcf503d7d8b67 100644
--- a/net/quic/core/quic_framer.cc
+++ b/net/quic/core/quic_framer.cc
@@ -655,9 +655,6 @@ bool QuicFramer::AppendPacketHeader(const QuicPacketHeader& header,
   if (header.public_header.version_flag) {
     public_flags |= PACKET_PUBLIC_FLAGS_VERSION;
   }
-  if (header.public_header.multipath_flag) {
-    public_flags |= PACKET_PUBLIC_FLAGS_MULTIPATH;
-  }
 
   public_flags |=
       GetPacketNumberFlags(header.public_header.packet_number_length)
@@ -774,19 +771,12 @@ bool QuicFramer::ProcessPublicHeader(QuicDataReader* reader,
     return false;
   }
 
-  public_header->multipath_flag =
-      (public_flags & PACKET_PUBLIC_FLAGS_MULTIPATH) != 0;
   public_header->reset_flag = (public_flags & PACKET_PUBLIC_FLAGS_RST) != 0;
   public_header->version_flag =
       (public_flags & PACKET_PUBLIC_FLAGS_VERSION) != 0;
 
   if (validate_flags_ && !public_header->version_flag &&
-      public_flags > (FLAGS_quic_reloadable_flag_quic_remove_multipath_bit
-                          ? PACKET_PUBLIC_FLAGS_MAX_WITHOUT_MULTIPATH_FLAG
-                          : PACKET_PUBLIC_FLAGS_MAX)) {
-    if (FLAGS_quic_reloadable_flag_quic_remove_multipath_bit) {
-      QUIC_FLAG_COUNT_N(quic_reloadable_flag_quic_remove_multipath_bit, 1, 2);
-    }
+      public_flags > PACKET_PUBLIC_FLAGS_MAX) {
     set_detailed_error("Illegal public flags value.");
     return false;
   }
@@ -827,13 +817,7 @@ bool QuicFramer::ProcessPublicHeader(QuicDataReader* reader,
     // If not, this raises an error.
     last_version_tag_ = version_tag;
     QuicVersion version = QuicTagToQuicVersion(version_tag);
-    if (version == quic_version_ &&
-        public_flags > (FLAGS_quic_reloadable_flag_quic_remove_multipath_bit
-                            ? PACKET_PUBLIC_FLAGS_MAX_WITHOUT_MULTIPATH_FLAG
-                            : PACKET_PUBLIC_FLAGS_MAX)) {
-      if (FLAGS_quic_reloadable_flag_quic_remove_multipath_bit) {
-        QUIC_FLAG_COUNT_N(quic_reloadable_flag_quic_remove_multipath_bit, 1, 2);
-      }
+    if (version == quic_version_ && public_flags > PACKET_PUBLIC_FLAGS_MAX) {
       set_detailed_error("Illegal public flags value.");
       return false;
     }