Remove dead code related to media device enumerations and monitoring.

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 26 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(audio)
   IPC_STRUCT_TRAITS_MEMBER(video)
   IPC_STRUCT_TRAITS_MEMBER(hotword_enabled)
   IPC_STRUCT_TRAITS_MEMBER(disable_local_echo)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::StreamDeviceInfo)
   IPC_STRUCT_TRAITS_MEMBER(device.type)
   IPC_STRUCT_TRAITS_MEMBER(device.name)
   IPC_STRUCT_TRAITS_MEMBER(device.id)
-  IPC_STRUCT_TRAITS_MEMBER(device.group_id)
   IPC_STRUCT_TRAITS_MEMBER(device.video_facing)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output_device_id)
   IPC_STRUCT_TRAITS_MEMBER(device.input.sample_rate)
   IPC_STRUCT_TRAITS_MEMBER(device.input.channel_layout)
   IPC_STRUCT_TRAITS_MEMBER(device.input.frames_per_buffer)
   IPC_STRUCT_TRAITS_MEMBER(device.input.effects)
   IPC_STRUCT_TRAITS_MEMBER(device.input.mic_positions)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.sample_rate)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.channel_layout)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.frames_per_buffer)
@@ skipping 32 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 */)
 
 // Request to cancel the request for a new media stream.
 IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_CancelGenerateStream,
                      int /* render frame id */,
                      int /* request id */)
 
 // Request to close a device that has been opened by GenerateStream.
 IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_StopStreamDevice,
                      int /* render frame id */,
                      std::string /*device_id*/)
 
-// Request to enumerate devices.
-// Used by Pepper and WebRTC.
-IPC_MESSAGE_CONTROL4(MediaStreamHostMsg_EnumerateDevices,
-                     int /* render frame id */,
-                     int /* request id */,
-                     content::MediaStreamType /* type */,
-                     url::Origin /* security origin */)
-
-// Request to stop enumerating devices.
-IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_CancelEnumerateDevices,
-                     int /* render frame id */,
-                     int /* request id */)
-
 // Request to open the device.
 IPC_MESSAGE_CONTROL5(MediaStreamHostMsg_OpenDevice,
                      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 */)
-
 // Tell the browser process if the video capture is secure (i.e., all
 // connected video sinks meet the requirement of output protection.).
 // Note: the browser process only trusts the |is_sucure| value in this IPC
 // message if it's comimg from a trusted, whitelisted extension. Extensions run
 // in separate render processes. So it shouldn't be possible, for example, for
 // a user's visit to a malicious web page to compromise a render process running
 // a trusted extension to make it report falsehood in this IPC message.
 IPC_MESSAGE_CONTROL3(MediaStreamHostMsg_SetCapturingLinkSecured,
                      int,                      /* session_id */
                      content::MediaStreamType, /* type */
                      bool /* is_secure */)