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

Source/core/dom/DocumentEncodingData.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DocumentEncodingData_h
 #define DocumentEncodingData_h
 
 #include "platform/CrossThreadCopier.h"
+#include "wtf/Allocator.h"
 #include "wtf/text/TextEncoding.h"
 
 namespace blink {
 class TextResourceDecoder;
 
 class DocumentEncodingData {
+    DISALLOW_ALLOCATION();
 public:
     DocumentEncodingData();
     explicit DocumentEncodingData(const TextResourceDecoder&);
 
     const WTF::TextEncoding& encoding() const { return m_encoding; }
     void setEncoding(const WTF::TextEncoding&);
     bool wasDetectedHeuristically() const { return m_wasDetectedHeuristically; }
     bool sawDecodingError() const { return m_sawDecodingError; }
 
 private:
     WTF::TextEncoding m_encoding;
     bool m_wasDetectedHeuristically;
     bool m_sawDecodingError;
 };
 
 template<> struct CrossThreadCopierBase<false, false, false, DocumentEncodingData> : public CrossThreadCopierPassThrough<DocumentEncodingData> {
 };
 
 inline bool operator!=(const DocumentEncodingData& a, const DocumentEncodingData& b)
 {
     return a.encoding() != b.encoding()
         || a.wasDetectedHeuristically() != b.wasDetectedHeuristically()
         || a.sawDecodingError() != b.sawDecodingError();
 }
 
 } // namespace blink
 
 #endif // DocumentEncodingData_h