Update HTML canvas classes to use OVERRIDE / FINAL when needed

Source/core/html/canvas/WebGLContextAttributes.h

 /*
  * Copyright (c) 2010, 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:
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
@@ skipping 16 matching lines @@
 #ifndef WebGLContextAttributes_h
 #define WebGLContextAttributes_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/html/canvas/CanvasContextAttributes.h"
 #include "public/platform/WebGraphicsContext3D.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
-class WebGLContextAttributes : public CanvasContextAttributes, public ScriptWrappable {
+class WebGLContextAttributes FINAL : public CanvasContextAttributes, public ScriptWrappable {
 public:
     virtual ~WebGLContextAttributes();
 
     // Create a new attributes object
     static PassRefPtr<WebGLContextAttributes> create();
 
     // Create a new attributes object initialized with preexisting attributes
     static PassRefPtr<WebGLContextAttributes> create(blink::WebGraphicsContext3D::Attributes);
 
     // Whether or not the drawing buffer has an alpha channel; default=true
@@ skipping 37 matching lines @@
     WebGLContextAttributes(blink::WebGraphicsContext3D::Attributes);
 
 private:
     blink::WebGraphicsContext3D::Attributes m_attrs;
     bool m_preserveDrawingBuffer;
 };
 
 } // namespace WebCore
 
 #endif // WebGLContextAttributes_h