Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/browser/web_contents/web_contents_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_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 395 matching lines @@
                     const ImageDownloadCallback& callback) override;
   bool IsSubframe() const override;
   void Find(int request_id,
             const base::string16& search_text,
             const blink::WebFindOptions& options) override;
   void StopFinding(StopFindAction action) override;
   bool WasRecentlyAudible() override;
   void GetManifest(const GetManifestCallback& callback) override;
   void ExitFullscreen(bool will_cause_resize) override;
   void ResumeLoadingCreatedWebContents() override;
-  void ResumeMediaSession() override;
-  void SuspendMediaSession() override;
-  void StopMediaSession() override;
   void OnPasswordInputShownOnHttp() override;
   void OnCreditCardInputShownOnHttp() override;
   void SetIsOverlayContent(bool is_overlay_content) override;
 
 #if defined(OS_ANDROID)
   base::android::ScopedJavaLocalRef<jobject> GetJavaWebContents() override;
   virtual WebContentsAndroid* GetWebContentsAndroid();
   void ActivateNearestFindResult(float x, float y) override;
   void RequestFindMatchRects(int current_version) override;
   service_manager::InterfaceProvider* GetJavaInterfaces() override;
 #elif defined(OS_MACOSX)
   void SetAllowOtherViews(bool allow) override;
   bool GetAllowOtherViews() override;
 #endif
 
-  // This method is called when the MediaSession state has changed, and will
-  // notify the WebContents observers.
-  void OnMediaSessionStateChanged();
-  // This method is called when the MediaSession metadata has changed, and will
-  // notify the WebContents observers.
-  void OnMediaSessionMetadataChanged();
-
   // Implementation of PageNavigator.
   WebContents* OpenURL(const OpenURLParams& params) override;
 
   // Implementation of IPC::Sender.
   bool Send(IPC::Message* message) override;
 
   // RenderFrameHostDelegate ---------------------------------------------------
   bool OnMessageReceived(RenderFrameHost* render_frame_host,
                          const IPC::Message& message) override;
   void OnAssociatedInterfaceRequest(
@@ skipping 1008 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_