Decouple MediaSession messages from WebContents (full patch)

content/browser/media/session/audio_focus_delegate.h

 // Copyright 2016 The Chromium Authors. All rights reserved.

[Zhiqiang Zhang (Slow), 2016/10/26 12:50:37]

Changes to audio_focus_delegate* are just a result of the MediaSession
abstraction, so they need MediaSessionImpl instead of MediaSession.

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_H_
 #define CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_H_
 
 #include "content/browser/media/session/audio_focus_manager.h"
-#include "content/browser/media/session/media_session.h"
 
 namespace content {
 
+class MediaSessionImpl;
+
 // AudioFocusDelegate is an interface abstracting audio focus handling for the
 // MediaSession class.
 class AudioFocusDelegate {
  public:
   // Factory method returning an implementation of AudioFocusDelegate.
   static std::unique_ptr<AudioFocusDelegate> Create(
-      MediaSession* media_session);
+      MediaSessionImpl* media_session);
 
   virtual ~AudioFocusDelegate() = default;
 
   virtual bool RequestAudioFocus(
       AudioFocusManager::AudioFocusType audio_focus_type) = 0;
   virtual void AbandonAudioFocus() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_SESSION_AUDIO_FOCUS_DELEGATE_H_