Completely removed the Extensions3D class (Take 2)

Source/platform/graphics/GraphicsContext3D.h

Index: Source/platform/graphics/GraphicsContext3D.h
diff --git a/Source/platform/graphics/GraphicsContext3D.h b/Source/platform/graphics/GraphicsContext3D.h
index bd807e965aac8cbc10e3ca9a784bfff099c108a6..3bd10a10ff18a1ea3cec0b06150cd1f5296a62df 100644
--- a/Source/platform/graphics/GraphicsContext3D.h
+++ b/Source/platform/graphics/GraphicsContext3D.h
@@ -28,7 +28,6 @@
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntRect.h"
-#include "platform/graphics/Extensions3D.h"
 #include "platform/graphics/GraphicsTypes3D.h"
 #include "platform/graphics/Image.h"
 #include "platform/weborigin/KURL.h"
@@ -58,7 +57,6 @@ class WebGraphicsContext3DProvider;
 
 namespace WebCore {
 class DrawingBuffer;
-class Extensions3D;
 class GraphicsContext3DContextLostCallbackAdapter;
 class GraphicsContext3DErrorMessageCallbackAdapter;
 class Image;
@@ -304,12 +302,6 @@ public:
     // getError in the order they were added.
     void synthesizeGLError(GLenum error);
 
-    // Support for extensions. Returns a non-null object, though not
-    // all methods it contains may necessarily be supported on the
-    // current hardware. Must call Extensions3D::supports() to
-    // determine this.
-    Extensions3D* extensions();
-
     static unsigned getClearBitsByFormat(GLenum);
 
     enum ChannelBits {
@@ -407,14 +399,15 @@ public:
 
     void setPackAlignment(GLint param);
 
-    // Extensions3D support.
+    // Extension support.
     bool supportsExtension(const String& name);
     bool ensureExtensionEnabled(const String& name);
     bool isExtensionEnabled(const String& name);
+    bool canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level);
 
-private:
-    friend class Extensions3D;
+    void paintFramebufferToCanvas(int framebuffer, int width, int height, bool premultiplyAlpha, ImageBuffer*);
 
+private:
     GraphicsContext3D(PassOwnPtr<blink::WebGraphicsContext3D>, bool preserveDrawingBuffer);
     GraphicsContext3D(PassOwnPtr<blink::WebGraphicsContext3DProvider>, bool preserveDrawingBuffer);
     GraphicsContext3D(blink::WebGraphicsContext3D* webContext);
@@ -427,7 +420,6 @@ private:
     // Implemented in GraphicsContext3DImagePacking.cpp
     static bool packPixels(const uint8_t* sourceData, DataFormat sourceDataFormat, unsigned width, unsigned height, unsigned sourceUnpackAlignment, unsigned destinationFormat, unsigned destinationType, AlphaOp, void* destinationData, bool flipY);
 
-    void paintFramebufferToCanvas(int framebuffer, int width, int height, bool premultiplyAlpha, ImageBuffer*);
     // Helper function to flip a bitmap vertically.
     void flipVertically(uint8_t* data, int width, int height);
 
@@ -440,7 +432,6 @@ private:
     OwnPtr<GraphicsContext3DContextLostCallbackAdapter> m_contextLostCallbackAdapter;
     OwnPtr<GraphicsContext3DErrorMessageCallbackAdapter> m_errorMessageCallbackAdapter;
     OwnPtr<blink::WebGraphicsContext3D> m_ownedWebContext;
-    OwnPtr<Extensions3D> m_extensions;
     bool m_initializedAvailableExtensions;
     HashSet<String> m_enabledExtensions;
     HashSet<String> m_requestableExtensions;