Implement MediaCaptureDevices.

content/public/browser/media_observer.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
 
 #include "base/callback_forward.h"
 #include "content/public/browser/media_request_state.h"
 #include "content/public/common/media_stream_request.h"
 
 namespace content {
 
 // An embedder may implement MediaObserver and return it from
 // ContentBrowserClient to receive callbacks as media events occur.
 class MediaObserver {
  public:
   // Called when a audio capture device is plugged in or unplugged.
-  virtual void OnAudioCaptureDevicesChanged(
-      const MediaStreamDevices& devices) = 0;
+  virtual void OnAudioCaptureDevicesChanged() = 0;
 
   // Called when a video capture device is plugged in or unplugged.
-  virtual void OnVideoCaptureDevicesChanged(
-      const MediaStreamDevices& devices) = 0;
+  virtual void OnVideoCaptureDevicesChanged() = 0;
 
   // Called when a media request changes state.
   virtual void OnMediaRequestStateChanged(
       int render_process_id,
       int render_view_id,
       int page_request_id,
       const GURL& security_origin,
       const MediaStreamDevice& device,
       MediaRequestState state) = 0;
 
@@ skipping 22 matching lines @@
       int render_frame_id,
       int stream_id) = 0;
 
  protected:
   virtual ~MediaObserver() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_