Oilpan: move DOM string collection objects to the Oilpan heap.

Source/core/html/HTMLOutputElement.cpp

 /*
  * Copyright (c) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 110 matching lines @@
 {
     if (m_defaultValue == value)
         return;
     m_defaultValue = value;
     // The spec requires the value attribute set to the default value
     // when the element's value mode flag to "default".
     if (m_isDefaultValueMode)
         setTextContent(value);
 }
 
+
+void HTMLOutputElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_tokens);
+    HTMLFormControlElement::trace(visitor);
+}
+
 } // namespace