Clean up virtual function in Source/html

Source/core/html/canvas/WebGLTexture.h

 /*
  * Copyright (C) 2009 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 58 matching lines @@
     static bool isNPOT(GLsizei, GLsizei);
 
     bool isNPOT() const;
     // Determine if texture sampling should always return [0, 0, 0, 1] (OpenGL ES 2.0 Sec 3.8.2).
     bool needToUseBlackTexture(TextureExtensionFlag) const;
 
     bool hasEverBeenBound() const { return object() && m_target; }
 
     static GLint computeLevelCount(GLsizei width, GLsizei height);
 
-protected:
+private:
     explicit WebGLTexture(WebGLRenderingContextBase*);
 
     virtual void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) override;
 
-private:
     class LevelInfo {
     public:
         LevelInfo()
             : valid(false)
             , internalFormat(0)
             , width(0)
             , height(0)
             , type(0)
         {
         }
@@ skipping 35 matching lines @@
     bool m_isCubeComplete;
     bool m_isComplete;
     bool m_needToUseBlackTexture;
     bool m_isFloatType;
     bool m_isHalfFloatType;
 };
 
 } // namespace blink
 
 #endif // WebGLTexture_h