Decouple MediaSession messages from WebContents (full patch)

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 31545357a62f7c08382d2f1e7c457a7d5e05cd7f..e2bd38788ffeb820c2a9968d9d94f1d29bb20a0d 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -708,13 +708,6 @@ class WebContents : public PageNavigator,
   // as soon as they are ready.
   virtual void ResumeLoadingCreatedWebContents() = 0;
 
-  // Requests to resume the current media session.
-  virtual void ResumeMediaSession() = 0;
-  // Requests to suspend the current media session.
-  virtual void SuspendMediaSession() = 0;
-  // Requests to stop the current media session.
-  virtual void StopMediaSession() = 0;
-
   // Called when the WebContents has displayed a password field on an
   // HTTP page. This method modifies the appropriate NavigationEntry's
   // SSLStatus to record the sensitive input field, so that embedders