Update HTML canvas classes to use OVERRIDE / FINAL when needed

Source/core/html/canvas/WebGLDebugShaders.h

 /*
  * 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 16 matching lines @@
 #define WebGLDebugShaders_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLExtension.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class WebGLShader;
 
-class WebGLDebugShaders : public WebGLExtension, public ScriptWrappable {
+class WebGLDebugShaders FINAL : public WebGLExtension, public ScriptWrappable {
 public:
     static PassRefPtr<WebGLDebugShaders> create(WebGLRenderingContext*);
     static bool supported(WebGLRenderingContext*);
     static const char* extensionName();
 
     virtual ~WebGLDebugShaders();
-    virtual ExtensionName name() const;
+    virtual ExtensionName name() const OVERRIDE;
 
     String getTranslatedShaderSource(WebGLShader*);
 
 private:
     WebGLDebugShaders(WebGLRenderingContext*);
 };
 
 } // namespace WebCore
 
 #endif // WebGLDebugShaders_h