Use macros instead of specializing VectorTraits explicitly

Source/core/html/FormDataList.h

 /*
  * Copyright (C) 2005, 2006, 2008 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
@@ skipping 77 matching lines @@
     void appendString(const CString&);
     void appendString(const String&);
     void appendBlob(PassRefPtrWillBeRawPtr<Blob>, const String& filename);
 
     WTF::TextEncoding m_encoding;
     WillBeHeapVector<Item> m_items;
 };
 
 } // namespace WebCore
 
-namespace WTF {
-template <> struct VectorTraits<WebCore::FormDataList::Item> : VectorTraitsBase<WebCore::FormDataList::Item> {
-    static const bool canInitializeWithMemset = true;
-};
-
-}
+WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(WebCore::FormDataList::Item);
 
 #endif // FormDataList_h