Merge GetIncomingDynamicStream and GetDynamicStream into a single GetOrCreateDynamicStream method i…

net/quic/quic_spdy_session.cc

 // Copyright (c) 2015 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/quic_spdy_session.h"
 
 #include "net/quic/quic_headers_stream.h"
 
 namespace net {
 
@@ skipping 56 matching lines @@
     const SpdyHeaderBlock& headers,
     bool fin,
     QuicPriority priority,
     QuicAckListenerInterface* ack_notifier_delegate) {
   return headers_stream_->WriteHeaders(id, headers, fin, priority,
                                        ack_notifier_delegate);
 }
 
 QuicSpdyStream* QuicSpdySession::GetSpdyDataStream(
     const QuicStreamId stream_id) {
-  return static_cast<QuicSpdyStream*>(GetDynamicStream(stream_id));
+  return static_cast<QuicSpdyStream*>(GetOrCreateDynamicStream(stream_id));
 }
 
 }  // namespace net