Deprecate rolled out FLAGS_enable_quic_connection_flow_control_2.

net/quic/quic_session.cc

Index: net/quic/quic_session.cc
diff --git a/net/quic/quic_session.cc b/net/quic/quic_session.cc
index 4c8f50d726ca7c918cbba4657022ac55e23d6c4b..ab69d3d0e48926a28a8366e5e70d3d08da8facc3 100644
--- a/net/quic/quic_session.cc
+++ b/net/quic/quic_session.cc
@@ -262,8 +262,7 @@ void QuicSession::OnWindowUpdateFrames(
       DVLOG(1) << ENDPOINT
                << "Received connection level flow control window update with "
                   "byte offset: " << frames[i].byte_offset;
-      if (FLAGS_enable_quic_connection_flow_control_2 &&
-          flow_controller_->UpdateSendWindowOffset(frames[i].byte_offset)) {
+      if (flow_controller_->UpdateSendWindowOffset(frames[i].byte_offset)) {
         connection_window_updated = true;
       }
       continue;
@@ -428,8 +427,7 @@ void QuicSession::CloseStreamInner(QuicStreamId stream_id,
   // of the how many bytes the stream's flow controller believes it has
   // received, for accurate connection level flow control accounting.
   if (!stream->HasFinalReceivedByteOffset() &&
-      stream->flow_controller()->IsEnabled() &&
-      FLAGS_enable_quic_connection_flow_control_2) {
+      stream->flow_controller()->IsEnabled()) {
     locally_closed_streams_highest_offset_[stream_id] =
         stream->flow_controller()->highest_received_byte_offset();
   }
@@ -440,10 +438,6 @@ void QuicSession::CloseStreamInner(QuicStreamId stream_id,
 
 void QuicSession::UpdateFlowControlOnFinalReceivedByteOffset(
     QuicStreamId stream_id, QuicStreamOffset final_byte_offset) {
-  if (!FLAGS_enable_quic_connection_flow_control_2) {
-    return;
-  }
-
   map<QuicStreamId, QuicStreamOffset>::iterator it =
       locally_closed_streams_highest_offset_.find(stream_id);
   if (it == locally_closed_streams_highest_offset_.end()) {