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..3d819c79d1b00d82a37e4023f83332c0f415c3a9 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -400,7 +400,6 @@ class CORE_EXPORT HTMLMediaElement
   bool isAutoplayingMuted() final;
   void requestReload(const WebURL&) final;
   void activateViewportIntersectionMonitoring(bool) final;
-
   void loadTimerFired(TimerBase*);
   void progressEventTimerFired(TimerBase*);
   void playbackProgressTimerFired(TimerBase*);
@@ -483,7 +482,7 @@ class CORE_EXPORT HTMLMediaElement
   void requireOfficialPlaybackPositionUpdate() const;
 
   void ensureMediaControls();
-  void configureMediaControls();
+  void updateControlsVisibility();
 
   TextTrackContainer& ensureTextTrackContainer();
 
@@ -746,6 +745,8 @@ class CORE_EXPORT HTMLMediaElement
 
   IntRect m_currentIntersectRect;
 
+  Member<MediaControls> m_mediaControls;
+
   static URLRegistry* s_mediaStreamRegistry;
 };