Revert of Add support for device-change notifications to MediaStreamDispatcher

content/renderer/media/media_stream_dispatcher.h

Index: content/renderer/media/media_stream_dispatcher.h
diff --git a/content/renderer/media/media_stream_dispatcher.h b/content/renderer/media/media_stream_dispatcher.h
index e75a029e2ab311aa0d57f35ca55d0107a616a786..a41850dc4749adc7778b9a1924eb647f452f3fd9 100644
--- a/content/renderer/media/media_stream_dispatcher.h
+++ b/content/renderer/media/media_stream_dispatcher.h
@@ -9,7 +9,6 @@
 #include <map>
 #include <memory>
 #include <string>
-#include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
@@ -83,17 +82,6 @@
   // Close a started device. |label| is provided in OnDeviceOpened.
   void CloseDevice(const std::string& label);
 
-  // Register and unregister event handlers for device-change notifications.
-  // It is an error to try to subscribe a handler that is already subscribed or
-  // to cancel the subscription of a handler that is not subscribed. Also,
-  // each subscribed handler must make sure to invoke
-  // CancelDeviceChangeNotifications() before the handler is destroyed.
-  void SubscribeToDeviceChangeNotifications(
-      const base::WeakPtr<MediaStreamDispatcherEventHandler>& event_handler,
-      const url::Origin& security_origin);
-  void CancelDeviceChangeNotifications(
-      const base::WeakPtr<MediaStreamDispatcherEventHandler>& event_handler);
-
   // Check if the label is a valid stream.
   virtual bool IsStream(const std::string& label);
   // Get the video session_id given a label. The label identifies a stream.
@@ -140,7 +128,6 @@
       const std::string& label,
       const StreamDeviceInfo& device_info);
   void OnDeviceOpenFailed(int request_id);
-  void OnDevicesChanged();
 
   // Used for DCHECKs so methods calls won't execute in the wrong thread.
   base::ThreadChecker thread_checker_;
@@ -154,9 +141,6 @@
   typedef std::list<Request> RequestList;
   RequestList requests_;
 
-  std::vector<base::WeakPtr<MediaStreamDispatcherEventHandler>>
-      device_change_subscribers_;
-
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDispatcher);
 };