[Chromecast] Add CastWebContents

chromecast/browser/android/cast_content_window_android.h

Index: chromecast/browser/android/cast_content_window_android.h
diff --git a/chromecast/browser/android/cast_content_window_android.h b/chromecast/browser/android/cast_content_window_android.h
index ff94bc516f270b571044c131f19ed64f68ab7134..5253be7c95b8a0c175001da40c42776cedfaafb0 100644
--- a/chromecast/browser/android/cast_content_window_android.h
+++ b/chromecast/browser/android/cast_content_window_android.h
@@ -38,11 +38,6 @@ class CastContentWindowAndroid : public CastContentWindow,
       content::BrowserContext* browser_context) override;
 
   // content::WebContentsObserver implementation:
-  void DidFirstVisuallyNonEmptyPaint() override;
-  void MediaStartedPlaying(const MediaPlayerInfo& media_info,
-                           const MediaPlayerId& id) override;
-  void MediaStoppedPlaying(const MediaPlayerInfo& media_info,
-                           const MediaPlayerId& id) override;
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
   // Called through JNI.