Revert of Add support for device-change notifications to MediaStreamDispatcher

content/common/media/media_stream_messages.h

 // 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.
 
 // IPC messages for the media streaming.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 77 matching lines @@
 // The browser has opened a device successfully.
 IPC_MESSAGE_ROUTED3(MediaStreamMsg_DeviceOpened,
                     int /* request id */,
                     std::string /* label */,
                     content::StreamDeviceInfo /* the device */)
 
 // The browser has failed to open a device.
 IPC_MESSAGE_ROUTED1(MediaStreamMsg_DeviceOpenFailed,
                     int /* request id */)
 
-// The browser has detected a change in the set of media devices.
-IPC_MESSAGE_ROUTED0(MediaStreamMsg_DevicesChanged)
-
 // Messages sent from the renderer to the browser.
 
 // Request a new media stream.
 IPC_MESSAGE_CONTROL5(MediaStreamHostMsg_GenerateStream,
                      int /* render frame id */,
                      int /* request id */,
                      content::StreamControls /* controls */,
                      url::Origin /* security origin */,
                      bool /* user_gesture */)
 
@@ skipping 25 matching lines @@
                      int /* render frame id */,
                      int /* request id */,
                      std::string /* device_id */,
                      content::MediaStreamType /* type */,
                      url::Origin /* security origin */)
 
 // Request to close a device.
 IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_CloseDevice,
                      int /* render frame id */,
                      std::string /*label*/)
-
-// Subscribe to notifications about changes in the set of media devices.
-IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_SubscribeToDeviceChangeNotifications,
-                     int /* render frame id */,
-                     url::Origin /* security origin */)
-
-// Cancel notifications about changes in the set of media devices.
-IPC_MESSAGE_CONTROL1(MediaStreamHostMsg_CancelDeviceChangeNotifications,
-                     int /* render frame id */)