Fix virtual/override/final usage in Source/core/dom/.

Source/core/dom/DOMArrayBuffer.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 DOMArrayBuffer_h
 #define DOMArrayBuffer_h
 
 #include "core/CoreExport.h"
 #include "core/dom/DOMArrayBufferBase.h"
 #include "wtf/ArrayBuffer.h"
@@ skipping 31 matching lines @@
     {
         return create(buffer()->slice(begin, end));
     }
     PassRefPtr<DOMArrayBuffer> slice(int begin) const
     {
         return create(buffer()->slice(begin));
     }
     bool transfer(WTF::ArrayBufferContents& result) { return buffer()->transfer(result); }
     bool isNeutered() { return buffer()->isNeutered(); }
 
-    virtual v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
-    virtual v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override;
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override;
 
 private:
     explicit DOMArrayBuffer(PassRefPtr<WTF::ArrayBuffer> buffer)
         : DOMArrayBufferBase(buffer)
     {
     }
 };
 
 } // namespace blink
 
 #endif // DOMArrayBuffer_h