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

Source/core/dom/IgnoreDestructiveWriteCountIncrementer.h

 /*
  * 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:
  * 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 #ifndef IgnoreDestructiveWriteCountIncrementer_h
 #define IgnoreDestructiveWriteCountIncrementer_h
 
 #include "core/dom/Document.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class IgnoreDestructiveWriteCountIncrementer {
+    STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(IgnoreDestructiveWriteCountIncrementer);
 public:
     explicit IgnoreDestructiveWriteCountIncrementer(Document* document)
         : m_count(document ? &document->m_ignoreDestructiveWriteCount : 0)
     {
         if (!m_count)
             return;
         ++(*m_count);
     }
 
     ~IgnoreDestructiveWriteCountIncrementer()
     {
         if (!m_count)
             return;
         --(*m_count);
     }
 
 private:
     unsigned* m_count;
 };
 
 }
 
 #endif