Media Controls: change how the MediaControls object is created and handled.

third_party/WebKit/Source/core/html/HTMLMediaElement.h

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.h b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
index 0ecace5d34fdb9a441537662c0cf2383bbb85744..05de20ea0119e09ac4cb5ccf83341e133eca71de 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -483,7 +483,7 @@ class CORE_EXPORT HTMLMediaElement
   void requireOfficialPlaybackPositionUpdate() const;
 
   void ensureMediaControls();
-  void configureMediaControls();
+  void updateControlsVisibility();
 
   TextTrackContainer& ensureTextTrackContainer();
 
@@ -746,6 +746,8 @@ class CORE_EXPORT HTMLMediaElement
 
   IntRect m_currentIntersectRect;
 
+  Member<MediaControls> m_mediaControls;
+
   static URLRegistry* s_mediaStreamRegistry;
 };