Refactored MediaStreamImpl to be a RenderViewObserver as the other delegates in RenderViewImpl.

content/renderer/media/mock_media_stream_impl.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 "content/renderer/media/mock_media_stream_impl.h"
 
 #include <utility>
 
 #include "content/renderer/media/rtc_video_decoder.h"
 
 MockMediaStreamImpl::MockMediaStreamImpl()
-    : MediaStreamImpl(NULL, NULL, NULL, NULL) {
+    : MediaStreamImpl(NULL, NULL, NULL, NULL, NULL) {
 }
 
 MockMediaStreamImpl::~MockMediaStreamImpl() {}
 
 WebKit::WebPeerConnectionHandler*
 MockMediaStreamImpl::CreatePeerConnectionHandler(
     WebKit::WebPeerConnectionHandlerClient* client) {
   NOTIMPLEMENTED();
   return NULL;
 }
@@ skipping 41 matching lines @@
     int index) {
   NOTIMPLEMENTED();
 }
 
 void MockMediaStreamImpl::AddTrack(
     const std::string& label,
     webrtc::MediaStreamTrackInterface* track) {
   mock_local_tracks_.insert(
       std::pair<std::string, webrtc::MediaStreamTrackInterface*>(label, track));
 }