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

Source/modules/webgl/WebGLSharedObject.h

 /*
  * Copyright (C) 2011 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 
 namespace blink {
 
 class WebGLContextGroup;
 class WebGLRenderingContextBase;
 
 // WebGLSharedObject the base class for objects that can be shared by multiple
 // WebGLRenderingContexts.
 class WebGLSharedObject : public WebGLObject {
 public:
-    virtual ~WebGLSharedObject();
+    ~WebGLSharedObject() override;
 
     WebGLContextGroup* contextGroup() const { return m_contextGroup; }
 
     virtual bool isBuffer() const { return false; }
     virtual bool isProgram() const { return false; }
     virtual bool isQuery() const { return false; }
     virtual bool isRenderbuffer() const { return false; }
     virtual bool isSampler() const { return false; }
     virtual bool isShader() const { return false; }
     virtual bool isSync() const { return false; }
     virtual bool isTexture() const { return false; }
     virtual bool isTransformFeedback() const { return false; }
 
-    virtual bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContextBase*) const override final
+    bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContextBase*) const final
     {
         return contextGroup == m_contextGroup;
     }
 
     void detachContextGroup();
 
 protected:
     explicit WebGLSharedObject(WebGLRenderingContextBase*);
 
-    virtual bool hasGroupOrContext() const override final
+    bool hasGroupOrContext() const final
     {
         return m_contextGroup;
     }
 
-    virtual WebGraphicsContext3D* getAWebGraphicsContext3D() const override final;
+    WebGraphicsContext3D* getAWebGraphicsContext3D() const final;
 
 private:
     WebGLContextGroup* m_contextGroup;
 };
 
 } // namespace blink
 
 #endif // WebGLSharedObject_h