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

Source/core/dom/CSSSelectorWatch.h

 /*
  * Copyright (C) 2013 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 27 matching lines @@
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class CORE_EXPORT CSSSelectorWatch final : public NoBaseWillBeGarbageCollectedFinalized<CSSSelectorWatch>, public WillBeHeapSupplement<Document> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CSSSelectorWatch);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CSSSelectorWatch);
 public:
     virtual ~CSSSelectorWatch() { }
 
     static CSSSelectorWatch& from(Document&);
     static CSSSelectorWatch* fromIfExists(Document&);
 
     void watchCSSSelectors(const Vector<String>& selectors);
     const WillBeHeapVector<RefPtrWillBeMember<StyleRule>>& watchedCallbackSelectors() const { return m_watchedCallbackSelectors; }
 
     void updateSelectorMatches(const Vector<String>& removedSelectors, const Vector<String>& addedSelectors);
@@ skipping 20 matching lines @@
     Timer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
 
     // When an element is reparented, the new location's style is evaluated after the expriation of the relayout timer.
     // We don't want to send redundant callbacks to the embedder, so this counter lets us wait another time around the event loop.
     int m_timerExpirations;
 };
 
 } // namespace blink
 
 #endif // CSSSelectorWatch_h