Completely removed the Extensions3D class (Take 2)

Source/core/html/canvas/EXTFragDepth.cpp

 /*
  * 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:
  *
  * 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
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 #include "config.h"
 
 #include "core/html/canvas/EXTFragDepth.h"
 
-#include "platform/graphics/Extensions3D.h"
-
 namespace WebCore {
 
 EXTFragDepth::EXTFragDepth(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
-    context->graphicsContext3D()->extensions()->ensureEnabled("GL_EXT_frag_depth");
+    context->graphicsContext3D()->ensureExtensionEnabled("GL_EXT_frag_depth");
 }
 
 EXTFragDepth::~EXTFragDepth()
 {
 }
 
 WebGLExtension::ExtensionName EXTFragDepth::name() const
 {
     return EXTFragDepthName;
 }
 
 PassRefPtr<EXTFragDepth> EXTFragDepth::create(WebGLRenderingContext* context)
 {
     return adoptRef(new EXTFragDepth(context));
 }
 
 bool EXTFragDepth::supported(WebGLRenderingContext* context)
 {
-    Extensions3D* extensions = context->graphicsContext3D()->extensions();
-    return extensions->supports("GL_EXT_frag_depth");
+    return context->graphicsContext3D()->supportsExtension("GL_EXT_frag_depth");
 }
 
 const char* EXTFragDepth::extensionName()
 {
     return "EXT_frag_depth";
 }
 
 } // namespace WebCore