[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/rendering/RenderFileUploadControl.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 namespace WebCore {
 
 class HTMLInputElement;
 
 // Each RenderFileUploadControl contains a RenderButton (for opening the file chooser), and
 // sufficient space to draw a file icon and filename. The RenderButton has a shadow node
 // associated with it to receive click/hover events.
 
 class RenderFileUploadControl FINAL : public RenderBlock {
 public:
-    RenderFileUploadControl(HTMLInputElement*);
+    RenderFileUploadControl(Handle<HTMLInputElement>);
     virtual ~RenderFileUploadControl();
 
     virtual bool isFileUploadControl() const { return true; }
 
     String buttonValue();
     String fileTextValue() const;
     
 private:
     virtual const char* renderName() const { return "RenderFileUploadControl"; }
 
     virtual bool canBeReplacedWithInlineRunIn() const OVERRIDE;
     virtual void updateFromElement();
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
     virtual void computePreferredLogicalWidths();
     virtual void paintObject(PaintInfo&, const LayoutPoint&);
 
     virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
 
     int maxFilenameWidth() const;
     
     virtual VisiblePosition positionForPoint(const LayoutPoint&);
 
-    HTMLInputElement* uploadButton() const;
+    Result<HTMLInputElement> uploadButton() const;
 
     bool m_canReceiveDroppedFiles;
 };
 
 inline RenderFileUploadControl* toRenderFileUploadControl(RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFileUploadControl());
     return static_cast<RenderFileUploadControl*>(object);
 }
 
 inline const RenderFileUploadControl* toRenderFileUploadControl(const RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFileUploadControl());
     return static_cast<const RenderFileUploadControl*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderFileUploadControl(const RenderFileUploadControl*);
 
 } // namespace WebCore
 
 #endif // RenderFileUploadControl_h