Fix virtual/override/final usage in Source/wtf/.

Source/wtf/Float64Array.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 33 matching lines @@
 
     using TypedArrayBase<double>::set;
 
     void set(unsigned index, double value)
     {
         if (index >= TypedArrayBase<double>::m_length)
             return;
         TypedArrayBase<double>::data()[index] = static_cast<double>(value);
     }
 
-    virtual ViewType type() const override
+    ViewType type() const override
     {
         return TypeFloat64;
     }
 
 private:
     inline Float64Array(PassRefPtr<ArrayBuffer>,
                  unsigned byteOffset,
                  unsigned length);
     // Make constructor visible to superclass.
     friend class TypedArrayBase<double>;
@@ skipping 17 matching lines @@
 Float64Array::Float64Array(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
     : TypedArrayBase<double>(buffer, byteOffset, length)
 {
 }
 
 } // namespace WTF
 
 using WTF::Float64Array;
 
 #endif // Float64Array_h