Let MediaControls use the parent HTMLMediaElement

Source/core/html/shadow/MediaControls.h

Index: Source/core/html/shadow/MediaControls.h
diff --git a/Source/core/html/shadow/MediaControls.h b/Source/core/html/shadow/MediaControls.h
index b3a5f07fc2076782beb0ba675911a562571209eb..669b295eb0d9a6c48c33c60505e8082ad1feeee5 100644
--- a/Source/core/html/shadow/MediaControls.h
+++ b/Source/core/html/shadow/MediaControls.h
@@ -37,9 +37,10 @@ class Event;
 
 class MediaControls FINAL : public HTMLDivElement {
 public:
-    static PassRefPtr<MediaControls> create(Document&);
+    static PassRefPtr<MediaControls> create(HTMLMediaElement&);
 
-    void setMediaController(MediaControllerInterface*);
+    HTMLMediaElement& mediaElement() const { return m_mediaElement; }
+    MediaControllerInterface& mediaControllerInterface() const;
 
     void reset();
 
@@ -65,9 +66,9 @@ public:
     void updateTextTrackDisplay();
 
 private:
-    explicit MediaControls(Document&);
+    explicit MediaControls(HTMLMediaElement&);
 
-    bool initializeControls(Document&);
+    bool initializeControls();
 
     void makeOpaque();
     void makeTransparent();
@@ -90,7 +91,7 @@ private:
     // Element
     virtual const AtomicString& shadowPseudoId() const OVERRIDE;
 
-    MediaControllerInterface* m_mediaController;
+    HTMLMediaElement& m_mediaElement;
 
     // Container for the media control elements.
     MediaControlPanelElement* m_panel;