Decouple MediaSession messages from WebContents (full patch)

content/browser/media/session/audio_focus_delegate.h

Index: content/browser/media/session/audio_focus_delegate.h
diff --git a/content/browser/media/session/audio_focus_delegate.h b/content/browser/media/session/audio_focus_delegate.h
index 064fa9b17c2c5b0a4cdb1bac0edb14db07cc884a..5df555a56e566794e485a1fd423400e590a3600e 100644
--- a/content/browser/media/session/audio_focus_delegate.h
+++ b/content/browser/media/session/audio_focus_delegate.h
@@ -6,17 +6,18 @@
 #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;