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

Source/modules/webgl/ANGLEInstancedArrays.h

 /*
  * Copyright (C) 2013 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
@@ skipping 26 matching lines @@
 
 class WebGLRenderingContextBase;
 
 class ANGLEInstancedArrays final : public WebGLExtension {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<ANGLEInstancedArrays> create(WebGLRenderingContextBase*);
     static bool supported(WebGLRenderingContextBase*);
     static const char* extensionName();
 
-    virtual ~ANGLEInstancedArrays();
-    virtual WebGLExtensionName name() const override;
+    ~ANGLEInstancedArrays() override;
+    WebGLExtensionName name() const override;
 
     void drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
     void drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, long long offset, GLsizei primcount);
     void vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
 
 private:
     explicit ANGLEInstancedArrays(WebGLRenderingContextBase*);
 };
 
 } // namespace blink
 
 #endif // ANGLEInstancedArrays_h