Ties RenderFrameImpl VIDEO_HOLE observer to lifetime of RenderWidget.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 5fca735a83f6f8e994616e0873b4f9b498506675..6e931fb590e2062a1d91108e938b066833a94111 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -638,6 +638,12 @@ class CONTENT_EXPORT RenderFrameImpl
   RendererCdmManager* cdm_manager_;
 #endif
 
+#if defined(VIDEO_HOLE)
+  // Whether or not this RenderFrameImpl contains a media player. Used to
+  // register as an observer for video-hole-specific events.
+  bool contains_media_player_;
+#endif
+
   // The geolocation dispatcher attached to this frame, lazily initialized.
   GeolocationDispatcher* geolocation_dispatcher_;