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

Source/core/dom/SpaceSplitString.h

 /*
  * Copyright (C) 2007, 2008, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  *
  */
 
 #ifndef SpaceSplitString_h
 #define SpaceSplitString_h
 
+#include "wtf/Allocator.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class SpaceSplitString {
+    WTF_MAKE_FAST_ALLOCATED(SpaceSplitString);
 public:
     enum CaseFolding { ShouldNotFoldCase, ShouldFoldCase };
     SpaceSplitString() { }
     SpaceSplitString(const AtomicString& string, CaseFolding caseFolding) { set(string, caseFolding); }
 
     bool operator!=(const SpaceSplitString& other) const { return m_data != other.m_data; }
 
     void set(const AtomicString&, CaseFolding);
     void clear() { m_data.clear(); }
 
@@ skipping 53 matching lines @@
         if (m_data && !m_data->isUnique())
             m_data = Data::createUnique(*m_data);
     }
 
     RefPtr<Data> m_data;
 };
 
 } // namespace blink
 
 #endif // SpaceSplitString_h