Update HTML canvas classes to use OVERRIDE / FINAL when needed

Source/core/html/canvas/WebGLSharedObject.h

Index: Source/core/html/canvas/WebGLSharedObject.h
diff --git a/Source/core/html/canvas/WebGLSharedObject.h b/Source/core/html/canvas/WebGLSharedObject.h
index 6c33471ba7fb52b7235e0e8da1211dc32a586337..8438728f3326a5642d59b482c877b0c64d538cb3 100644
--- a/Source/core/html/canvas/WebGLSharedObject.h
+++ b/Source/core/html/canvas/WebGLSharedObject.h
@@ -43,13 +43,12 @@ public:
     WebGLContextGroup* contextGroup() const { return m_contextGroup; }
 
     virtual bool isBuffer() const { return false; }
-    virtual bool isFramebuffer() const { return false; }
     virtual bool isProgram() const { return false; }
     virtual bool isRenderbuffer() const { return false; }
     virtual bool isShader() const { return false; }
     virtual bool isTexture() const { return false; }
 
-    virtual bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContext*) const
+    virtual bool validate(const WebGLContextGroup* contextGroup, const WebGLRenderingContext*) const OVERRIDE FINAL
     {
         return contextGroup == m_contextGroup;
     }
@@ -59,12 +58,12 @@ public:
 protected:
     WebGLSharedObject(WebGLRenderingContext*);
 
-    virtual bool hasGroupOrContext() const
+    virtual bool hasGroupOrContext() const OVERRIDE FINAL
     {
         return m_contextGroup;
     }
 
-    virtual GraphicsContext3D* getAGraphicsContext3D() const;
+    virtual GraphicsContext3D* getAGraphicsContext3D() const OVERRIDE FINAL;
 
 private:
     WebGLContextGroup* m_contextGroup;