Remove OnDataAvailable() notification when trailers are to be delivered

net/quic/chromium/quic_chromium_client_stream.cc

 // Copyright (c) 2012 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.
 
 #include "net/quic/chromium/quic_chromium_client_stream.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/callback_helpers.h"
@@ skipping 118 matching lines @@
 
   session_->HandlePromised(id(), promised_id, promise_headers);
 }
 
 void QuicChromiumClientStream::OnDataAvailable() {
   if (!FinishedReadingHeaders() || !headers_delivered_) {
     // Buffer the data in the sequencer until the headers have been read.
     return;
   }
 
+  if (!sequencer()->HasBytesToRead() && !FinishedReadingTrailers()) {
+    // If there is no data to read, wait until either FIN is received or
+    // trailers are delivered.
+    return;
+  }
+
   // The delegate will read the data via a posted task, and
   // will be able to, potentially, read all data which has queued up.
   NotifyDelegateOfDataAvailableLater();
 }
 
 void QuicChromiumClientStream::OnClose() {
   if (delegate_) {
     delegate_->OnClose();
     delegate_ = nullptr;
     delegate_tasks_.clear();
@@ skipping 167 matching lines @@
 
 void QuicChromiumClientStream::DisableConnectionMigration() {
   can_migrate_ = false;
 }
 
 bool QuicChromiumClientStream::IsFirstStream() {
   return id() == kHeadersStreamId + 2;
 }
 
 }  // namespace net