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

Source/core/dom/DOMTokenList.h

Index: Source/core/dom/DOMTokenList.h
diff --git a/Source/core/dom/DOMTokenList.h b/Source/core/dom/DOMTokenList.h
index bd5204e9f12f726caace85316090e240137158de..8729b82d0bae8813483197d3e244eb25b755c421 100644
--- a/Source/core/dom/DOMTokenList.h
+++ b/Source/core/dom/DOMTokenList.h
@@ -26,6 +26,7 @@
 #define DOMTokenList_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 
@@ -34,8 +35,9 @@ namespace WebCore {
 class Element;
 class ExceptionState;
 
-class DOMTokenList : public ScriptWrappable {
-    WTF_MAKE_NONCOPYABLE(DOMTokenList); WTF_MAKE_FAST_ALLOCATED;
+class DOMTokenList : public NoBaseWillBeGarbageCollectedFinalized<DOMTokenList>, public ScriptWrappable {
+    WTF_MAKE_NONCOPYABLE(DOMTokenList);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     DOMTokenList()
     {
@@ -43,8 +45,10 @@ public:
     }
     virtual ~DOMTokenList() { };
 
+#if !ENABLE(OILPAN)
     virtual void ref() = 0;
     virtual void deref() = 0;
+#endif
 
     virtual unsigned length() const = 0;
     virtual const AtomicString item(unsigned index) const = 0;
@@ -61,6 +65,8 @@ public:
 
     virtual Element* element() { return 0; }
 
+    virtual void trace(Visitor*) { }
+
 protected:
     virtual const AtomicString& value() const = 0;
     virtual void setValue(const AtomicString&) = 0;