disable media stream creation when enable_webrtc=0

content/renderer/media/media_stream_dependency_factory_stub.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/media_stream_dependency_factory.h"
-
-MediaStreamDependencyFactory::MediaStreamDependencyFactory() {}
-
-MediaStreamDependencyFactory::~MediaStreamDependencyFactory() {}
-
-bool MediaStreamDependencyFactory::CreatePeerConnectionFactory(
-    talk_base::Thread* worker_thread,
-    talk_base::Thread* signaling_thread,
-    content::P2PSocketDispatcher* socket_dispatcher,
-    talk_base::NetworkManager* network_manager,
-    talk_base::PacketSocketFactory* socket_factory) {
-  return false;
-}
-
-void MediaStreamDependencyFactory::ReleasePeerConnectionFactory() {
-}
-
-bool MediaStreamDependencyFactory::PeerConnectionFactoryCreated() {
-  return false;
-}
-
-talk_base::scoped_refptr<webrtc::PeerConnectionInterface>
-MediaStreamDependencyFactory::CreatePeerConnection(
-    const std::string& config,
-    webrtc::PeerConnectionObserver* observer) {
-  return NULL;
-}
-
-talk_base::scoped_refptr<webrtc::LocalMediaStreamInterface>
-MediaStreamDependencyFactory::CreateLocalMediaStream(const std::string& label) {
-  return NULL;
-}
-
-talk_base::scoped_refptr<webrtc::LocalVideoTrackInterface>
-MediaStreamDependencyFactory::CreateLocalVideoTrack(
-    const std::string& label,
-    cricket::VideoCapturer* video_device) {
-  return NULL;
-}
-
-talk_base::scoped_refptr<webrtc::LocalAudioTrackInterface>
-MediaStreamDependencyFactory::CreateLocalAudioTrack(
-    const std::string& label,
-    webrtc::AudioDeviceModule* audio_device) {
-  return NULL;
-}