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

Source/core/dom/DOMArrayBuffer.h

Index: Source/core/dom/DOMArrayBuffer.h
diff --git a/Source/core/dom/DOMArrayBuffer.h b/Source/core/dom/DOMArrayBuffer.h
index 29cac015315a4a9224feb4bb036a228d72428f2a..85549e349ebedbfd8b95b8d2f88b2a4a2858fc0e 100644
--- a/Source/core/dom/DOMArrayBuffer.h
+++ b/Source/core/dom/DOMArrayBuffer.h
@@ -49,8 +49,8 @@ public:
     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)