Deprecate --gfe2_reloadable_flag_quic_supports_trailers

net/quic/quic_spdy_stream.cc

Index: net/quic/quic_spdy_stream.cc
diff --git a/net/quic/quic_spdy_stream.cc b/net/quic/quic_spdy_stream.cc
index d764283986ce0cec75a8b10bb0a13f22990dd5d5..9e0b0aea39201d26371a767c55adbb04e9766934 100644
--- a/net/quic/quic_spdy_stream.cc
+++ b/net/quic/quic_spdy_stream.cc
@@ -96,9 +96,6 @@ size_t QuicSpdyStream::WriteHeaders(
 size_t QuicSpdyStream::WriteTrailers(
     SpdyHeaderBlock trailer_block,
     QuicAckListenerInterface* ack_notifier_delegate) {
-  if (!FLAGS_quic_supports_trailers) {
-    return 0;
-  }
   if (fin_sent()) {
     QUIC_BUG << "Trailers cannot be sent after a FIN.";
     return 0;
@@ -151,8 +148,7 @@ bool QuicSpdyStream::IsDoneReading() const {
 bool QuicSpdyStream::HasBytesToRead() const {
   bool headers_to_read = !decompressed_headers_.empty();
   bool body_to_read = sequencer()->HasBytesToRead();
-  bool trailers_to_read =
-      (FLAGS_quic_supports_trailers && !decompressed_trailers_.empty());
+  bool trailers_to_read = !decompressed_trailers_.empty();
   return headers_to_read || body_to_read || trailers_to_read;
 }
 
@@ -174,7 +170,7 @@ void QuicSpdyStream::SetPriority(SpdyPriority priority) {
 }
 
 void QuicSpdyStream::OnStreamHeaders(StringPiece headers_data) {
-  if (!FLAGS_quic_supports_trailers || !headers_decompressed_) {
+  if (!headers_decompressed_) {
     headers_data.AppendToString(&decompressed_headers_);
   } else {
     DCHECK(!trailers_decompressed_);
@@ -188,7 +184,7 @@ void QuicSpdyStream::OnStreamHeadersPriority(SpdyPriority priority) {
 }
 
 void QuicSpdyStream::OnStreamHeadersComplete(bool fin, size_t frame_len) {
-  if (!FLAGS_quic_supports_trailers || !headers_decompressed_) {
+  if (!headers_decompressed_) {
     OnInitialHeadersComplete(fin, frame_len);
   } else {
     OnTrailingHeadersComplete(fin, frame_len);
@@ -266,9 +262,6 @@ bool QuicSpdyStream::FinishedReadingHeaders() const {
 }
 
 bool QuicSpdyStream::FinishedReadingTrailers() const {
-  if (!FLAGS_quic_supports_trailers) {
-    return true;
-  }
   // If no further trailing headers are expected, and the decompressed trailers
   // (if any) have been consumed, then reading of trailers is finished.
   bool no_more_trailers = fin_received() || trailers_decompressed_;