Make classes and structures in core/dom fast-allocated.

Source/core/dom/NodeListsNodeData.h

Index: Source/core/dom/NodeListsNodeData.h
diff --git a/Source/core/dom/NodeListsNodeData.h b/Source/core/dom/NodeListsNodeData.h
index c5ee78dffcd5574048d3dfa0b6f677bddef2d79c..3deeb3be5096a48f1cecb37ec45f4e7bcf151e5d 100644
--- a/Source/core/dom/NodeListsNodeData.h
+++ b/Source/core/dom/NodeListsNodeData.h
@@ -80,6 +80,7 @@ public:
 #endif
 
     struct NodeListAtomicCacheMapEntryHash {
+        STATIC_ONLY(NodeListAtomicCacheMapEntryHash);
         static unsigned hash(const std::pair<unsigned char, StringImpl*>& entry)
         {
             return DefaultHash<StringImpl*>::Hash::hash(entry.second) + entry.first;