MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/media/user_media_client_impl.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_RENDERER_MEDIA_USER_MEDIA_CLIENT_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_USER_MEDIA_CLIENT_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 125 matching lines @@
                          bool enable_automatic_output_device_selection);
     ~UserMediaRequestInfo();
     int request_id;
     // True if MediaStreamDispatcher has generated the stream, see
     // OnStreamGenerated.
     bool generated;
     const bool enable_automatic_output_device_selection;
     blink::WebMediaStream web_stream;
     blink::WebUserMediaRequest request;
 
-    void StartAudioTrack(const blink::WebMediaStreamTrack& track,
-                         const blink::WebMediaConstraints& constraints);
+    void StartAudioTrack(const blink::WebMediaStreamTrack& track);
 
     blink::WebMediaStreamTrack CreateAndStartVideoTrack(
         const blink::WebMediaStreamSource& source,
         const blink::WebMediaConstraints& constraints);
 
     // Triggers |callback| when all sources used in this request have either
     // successfully started, or a source has failed to start.
     void CallbackOnTracksStarted(const ResourcesReady& callback);
 
     bool IsSourceUsed(const blink::WebMediaStreamSource& source) const;
@@ skipping 100 matching lines @@
   // Note: This member must be the last to ensure all outstanding weak pointers
   // are invalidated first.
   base::WeakPtrFactory<UserMediaClientImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserMediaClientImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_USER_MEDIA_CLIENT_IMPL_H_