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

Source/core/dom/DatasetDOMStringMap.cpp

 /*
  * Copyright (C) 2010 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 122 matching lines @@
         if (isASCIIUpper(character)) {
             builder.append('-');
             builder.append(toASCIILower(character));
         } else
             builder.append(character);
     }
 
     return builder.toAtomicString();
 }
 
+#if !ENABLE(OILPAN)
 void DatasetDOMStringMap::ref()
 {
     m_element->ref();
 }
 
 void DatasetDOMStringMap::deref()
 {
     m_element->deref();
 }
+#endif
 
 void DatasetDOMStringMap::getNames(Vector<String>& names)
 {
     if (!m_element->hasAttributes())
         return;
 
     unsigned length = m_element->attributeCount();
     for (unsigned i = 0; i < length; i++) {
         const Attribute& attribute = m_element->attributeItem(i);
         if (isValidAttributeName(attribute.localName()))
@@ skipping 46 matching lines @@
     if (isValidPropertyName(name)) {
         AtomicString attributeName = convertPropertyNameToAttributeName(name);
         if (m_element->hasAttribute(attributeName)) {
             m_element->removeAttribute(attributeName);
             return true;
         }
     }
     return false;
 }
 
+void DatasetDOMStringMap::trace(Visitor* visitor)
+{
+    visitor->trace(m_element);

[Mads Ager (chromium), 2014/04/29 09:05:14]

Yeah, since you are tracing m_element, please put it in a Member. We should stay
away from tracing raw pointers when we can. If I see a raw pointer that is not
in a union I will assume that it is not traced. 

+    DOMStringMap::trace(visitor);
+}
+
 } // namespace WebCore