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

Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 829 matching lines @@
         return LTR;
     }
 
     isAuto = true;
     return directionality();
 }
 
 TextDirection HTMLElement::directionality(Node** strongDirectionalityTextNode) const
 {
     if (isHTMLTextFormControlElement(this)) {
-        HTMLTextFormControlElement* textElement = toHTMLTextFormControlElement(const_cast<HTMLElement*>(this));
+        Handle<HTMLTextFormControlElement> textElement = toHTMLTextFormControlElement(const_cast<HTMLElement*>(this));
         bool hasStrongDirectionality;
         Unicode::Direction textDirection = textElement->value().defaultWritingDirection(&hasStrongDirectionality);
         if (strongDirectionalityTextNode)
-            *strongDirectionalityTextNode = hasStrongDirectionality ? textElement : 0;
+            *strongDirectionalityTextNode = hasStrongDirectionality ? textElement.raw() : 0;
         return (textDirection == Unicode::LeftToRight) ? LTR : RTL;
     }
 
     Node* node = firstChild();
     while (node) {
         // Skip bdi, script, style and text form controls.
         if (equalIgnoringCase(node->nodeName(), "bdi") || node->hasTagName(scriptTag) || node->hasTagName(styleTag) 
             || (node->isElementNode() && toElement(node)->isTextFormControl())) {
             node = NodeTraversal::nextSkippingChildren(node, this);
             continue;
@@ skipping 177 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(WebCore::HTMLElement*);
 
 void dumpInnerHTML(WebCore::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif