Refactor media out of WebContentsImpl to MediaWebContentsObserver.

chromecast/browser/cast_content_window.h

 // Copyright 2014 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 CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_
 #define CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 28 matching lines @@
   // Create a window with the given size for |web_contents|.
   void CreateWindowTree(const gfx::Size& initial_size,
                         content::WebContents* web_contents);
 
   scoped_ptr<content::WebContents> CreateWebContents(
       const gfx::Size& initial_size,
       content::BrowserContext* browser_context);
 
   // content::WebContentsObserver implementation:
   void DidFirstVisuallyNonEmptyPaint() override;
-  void MediaPaused() override;
-  void MediaStartedPlaying() override;
+  void MediaStoppedPlaying(const MediaPlayerId& id) override;
+  void MediaStartedPlaying(const MediaPlayerId& id) override;
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
  private:
 #if defined(USE_AURA)
   scoped_ptr<aura::WindowTreeHost> window_tree_host_;
 #endif
   bool transparent_;
 
   DISALLOW_COPY_AND_ASSIGN(CastContentWindow);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_