disable media stream creation when enable_webrtc=0

content/renderer/media/media_stream_impl_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_impl.h"
-
-#include "content/renderer/media/media_stream_dependency_factory.h"
-#include "content/renderer/media/rtc_video_decoder.h"
-#include "content/renderer/media/video_capture_impl_manager.h"
-#include "content/renderer/p2p/ipc_socket_factory.h"
-
-MediaStreamImpl::MediaStreamImpl(
-    MediaStreamDispatcher* media_stream_dispatcher,
-    content::P2PSocketDispatcher* p2p_socket_dispatcher,
-    VideoCaptureImplManager* vc_manager,
-    MediaStreamDependencyFactory* dependency_factory)
-    : dependency_factory_(dependency_factory),
-      media_stream_dispatcher_(media_stream_dispatcher),
-      p2p_socket_dispatcher_(p2p_socket_dispatcher),
-      network_manager_(NULL),
-      vc_manager_(vc_manager),
-      peer_connection_handler_(NULL),
-      message_loop_proxy_(base::MessageLoopProxy::current()),
-      signaling_thread_(NULL),
-      worker_thread_(NULL),
-      chrome_worker_thread_("Chrome_libJingle_WorkerThread") {
-}
-
-MediaStreamImpl::~MediaStreamImpl() {}
-
-WebKit::WebPeerConnectionHandler* MediaStreamImpl::CreatePeerConnectionHandler(
-    WebKit::WebPeerConnectionHandlerClient* client) {
-  return NULL;
-}
-
-void MediaStreamImpl::ClosePeerConnection() {
-}
-
-webrtc::MediaStreamTrackInterface* MediaStreamImpl::GetLocalMediaStreamTrack(
-    const std::string& label) {
-  return NULL;
-}
-
-void MediaStreamImpl::requestUserMedia(
-    const WebKit::WebUserMediaRequest& user_media_request,
-    const WebKit::WebVector<WebKit::WebMediaStreamSource>&
-        media_stream_source_vector) {
-}
-
-void MediaStreamImpl::cancelUserMediaRequest(
-    const WebKit::WebUserMediaRequest& user_media_request) {
-}
-
-scoped_refptr<media::VideoDecoder> MediaStreamImpl::GetVideoDecoder(
-    const GURL& url,
-    media::MessageLoopFactory* message_loop_factory) {
-  return NULL;
-}
-
-void MediaStreamImpl::OnStreamGenerated(
-    int request_id,
-    const std::string& label,
-    const media_stream::StreamDeviceInfoArray& audio_array,
-    const media_stream::StreamDeviceInfoArray& video_array) {
-}
-
-void MediaStreamImpl::OnStreamGenerationFailed(int request_id) {}
-
-void MediaStreamImpl::OnVideoDeviceFailed(const std::string& label,
-                                          int index) {
-}
-
-void MediaStreamImpl::OnAudioDeviceFailed(const std::string& label,
-                                          int index) {
-}
-
-void MediaStreamImpl::OnDevicesEnumerated(
-    int request_id,
-    const media_stream::StreamDeviceInfoArray& device_array) {
-}
-
-void MediaStreamImpl::OnDevicesEnumerationFailed(int request_id) {}
-
-void MediaStreamImpl::OnDeviceOpened(
-    int request_id,
-    const std::string& label,
-    const media_stream::StreamDeviceInfo& video_device) {
-}
-
-void MediaStreamImpl::OnDeviceOpenFailed(int request_id) {}