Begin adding support for tab mirroring via the MediaStream audio/video capturing

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index c9a409a84366080919510b2baa62585c25cd27a8..f268dc523d5ac4944219f2d06666bd4a7383fcd7 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -26,9 +26,7 @@
 #include "content/browser/in_process_webkit/webkit_thread.h"
 #include "content/browser/net/browser_online_state_observer.h"
 #include "content/browser/plugin_service_impl.h"
-#include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
-#include "content/browser/renderer_host/media/video_capture_manager.h"
 #include "content/browser/renderer_host/resource_dispatcher_host_impl.h"
 #include "content/browser/speech/speech_recognition_manager_impl.h"
 #include "content/browser/trace_controller_impl.h"
@@ -341,13 +339,8 @@ void BrowserMainLoop::MainMessageLoopStart() {
   network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
   audio_manager_.reset(media::AudioManager::Create());
   online_state_observer_.reset(new BrowserOnlineStateObserver);
-  scoped_refptr<media_stream::AudioInputDeviceManager>
-      audio_input_device_manager(
-          new media_stream::AudioInputDeviceManager(audio_manager_.get()));
-  scoped_refptr<media_stream::VideoCaptureManager> video_capture_manager(
-      new media_stream::VideoCaptureManager());
-  media_stream_manager_.reset(new media_stream::MediaStreamManager(
-      audio_input_device_manager, video_capture_manager));
+  media_stream_manager_.reset(
+      new media_stream::MediaStreamManager(audio_manager_.get()));
 
 #if defined(OS_WIN)
   system_message_window_.reset(new SystemMessageWindowWin);