Completely removed the Extensions3D class (Take 2)

Source/core/html/canvas/OESTextureFloat.cpp

Index: Source/core/html/canvas/OESTextureFloat.cpp
diff --git a/Source/core/html/canvas/OESTextureFloat.cpp b/Source/core/html/canvas/OESTextureFloat.cpp
index 99d1387376ca3de38af88024da282007297e1ac0..fffed2754513e772a5132bf0e1ec3cb389d71444 100644
--- a/Source/core/html/canvas/OESTextureFloat.cpp
+++ b/Source/core/html/canvas/OESTextureFloat.cpp
@@ -26,7 +26,6 @@
 #include "config.h"
 
 #include "core/html/canvas/OESTextureFloat.h"
-#include "platform/graphics/Extensions3D.h"
 
 namespace WebCore {
 
@@ -34,7 +33,7 @@ OESTextureFloat::OESTextureFloat(WebGLRenderingContext* context)
     : WebGLExtension(context)
 {
     ScriptWrappable::init(this);
-    context->graphicsContext3D()->extensions()->ensureEnabled("GL_OES_texture_float");
+    context->graphicsContext3D()->ensureExtensionEnabled("GL_OES_texture_float");
 }
 
 OESTextureFloat::~OESTextureFloat()
@@ -53,8 +52,7 @@ PassRefPtr<OESTextureFloat> OESTextureFloat::create(WebGLRenderingContext* conte
 
 bool OESTextureFloat::supported(WebGLRenderingContext* context)
 {
-    Extensions3D* extensions = context->graphicsContext3D()->extensions();
-    return extensions->supports("GL_OES_texture_float");
+    return context->graphicsContext3D()->supportsExtension("GL_OES_texture_float");
 }
 
 const char* OESTextureFloat::extensionName()