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

Source/core/dom/DOMArrayPiece.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMArrayPiece_h
 #define DOMArrayPiece_h
 
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMArrayBufferView.h"
 #include "wtf/ArrayPiece.h"
 
 namespace blink {
 
 class ArrayBufferOrArrayBufferView;
 
 // This class is for passing around un-owned bytes as a pointer + length.
 // It supports implicit conversion from several other data types.
 //
 // ArrayPiece has the concept of being "null". This is different from an empty
 // byte range. It is invalid to call methods other than isNull() on such
 // instances.
 //
 // IMPORTANT: The data contained by ArrayPiece is NOT OWNED, so caution must be
 //            taken to ensure it is kept alive.
 class CORE_EXPORT DOMArrayPiece : public WTF::ArrayPiece {
+    DISALLOW_ALLOCATION();
 public:
     enum InitWithUnionOption {
         // Initialize this object as "null" when initialized with an union which
         // holds null.
         TreatNullAsNull,
         // Initialize this object so this points to null pointer with zero size
         // when initialized with an union which holds null.
         AllowNullPointToNullWithZeroSize,
     };
 
@@ skipping 11 matching lines @@
 
     bool operator==(const DOMArrayBufferView& other) const
     {
         return byteLength() == other.byteLength() && memcmp(data(), other.baseAddress(), byteLength()) == 0;
     }
 };
 
 } // namespace blink
 
 #endif // DOMArrayPiece_h