Oilpan: trace MediaControlElement's element reference.

Source/core/html/shadow/MediaControlElementTypes.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 61 matching lines @@
 
 // ----------------------------
 
 class MediaControlElement : public WillBeGarbageCollectedMixin {
 public:
     void hide();
     void show();
 
     MediaControlElementType displayType() { return m_displayType; }
 
+    virtual void trace(Visitor*);
+
 protected:
     MediaControlElement(MediaControls&, MediaControlElementType, HTMLElement*);
 
     MediaControls& mediaControls() const { return m_mediaControls; }
     HTMLMediaElement& mediaElement() const;
 
     void setDisplayType(MediaControlElementType);
 
 private:
     MediaControls& m_mediaControls;
     MediaControlElementType m_displayType;
-    HTMLElement* m_element;
+    RawPtrWillBeMember<HTMLElement> m_element;
 };
 
 // ----------------------------
 
 class MediaControlDivElement : public HTMLDivElement, public MediaControlElement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaControlDivElement);
+public:
+    virtual void trace(Visitor*) OVERRIDE;
 
 protected:
     virtual bool isMediaControlElement() const OVERRIDE FINAL { return true; }
     MediaControlDivElement(MediaControls&, MediaControlElementType);
 };
 
 // ----------------------------
 
 class MediaControlInputElement : public HTMLInputElement, public MediaControlElement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaControlInputElement);
+public:
+    virtual void trace(Visitor*) OVERRIDE;
 
 protected:
     virtual bool isMediaControlElement() const OVERRIDE FINAL { return true; }
     MediaControlInputElement(MediaControls&, MediaControlElementType);
 
 private:
     virtual void updateDisplayType() { }
     virtual bool isMouseFocusable() const OVERRIDE;
 };
 
 // ----------------------------
 
 class MediaControlTimeDisplayElement : public MediaControlDivElement {
 public:
     void setCurrentValue(double);
     double currentValue() const { return m_currentValue; }
 
 protected:
     MediaControlTimeDisplayElement(MediaControls&, MediaControlElementType);
 
 private:
     double m_currentValue;
 };
 
 } // namespace WebCore
 
 #endif // MediaControlElementTypes_h