Completely removed the Extensions3D class (Take 2)

Source/platform/graphics/ImageBuffer.cpp

Index: Source/platform/graphics/ImageBuffer.cpp
diff --git a/Source/platform/graphics/ImageBuffer.cpp b/Source/platform/graphics/ImageBuffer.cpp
index 33c9cfec1b66d484e242eb7c10008965f269963b..22ddbc2e86a9937dbc0af9cc9443b2daf415fcf8 100644
--- a/Source/platform/graphics/ImageBuffer.cpp
+++ b/Source/platform/graphics/ImageBuffer.cpp
@@ -36,7 +36,6 @@
 #include "platform/MIMETypeRegistry.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/BitmapImage.h"
-#include "platform/graphics/Extensions3D.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsContext3D.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
@@ -48,6 +47,7 @@
 #include "platform/image-encoders/skia/PNGImageEncoder.h"
 #include "platform/image-encoders/skia/WEBPImageEncoder.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebGraphicsContext3D.h"
 #include "third_party/skia/include/effects/SkTableColorFilter.h"
 #include "wtf/MathExtras.h"
 #include "wtf/text/Base64.h"
@@ -134,20 +134,19 @@ bool ImageBuffer::copyToPlatformTexture(GraphicsContext3D& context, Platform3DOb
     if (!context.makeContextCurrent())
         return false;
 
-    Extensions3D* extensions = context.extensions();
-    if (!extensions->supports("GL_CHROMIUM_copy_texture") || !extensions->supports("GL_CHROMIUM_flipy")
-        || !extensions->canUseCopyTextureCHROMIUM(internalFormat, destType, level))
+    if (!context.supportsExtension("GL_CHROMIUM_copy_texture") || !context.supportsExtension("GL_CHROMIUM_flipy")
+        || !context.canUseCopyTextureCHROMIUM(internalFormat, destType, level))
         return false;
 
     // The canvas is stored in a premultiplied format, so unpremultiply if necessary.
-    context.pixelStorei(Extensions3D::UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
+    context.pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
 
     // The canvas is stored in an inverted position, so the flip semantics are reversed.
-    context.pixelStorei(Extensions3D::UNPACK_FLIP_Y_CHROMIUM, !flipY);
-    extensions->copyTextureCHROMIUM(GL_TEXTURE_2D, getBackingTexture(), texture, level, internalFormat, destType);
+    context.pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, !flipY);
+    context.webContext()->copyTextureCHROMIUM(GL_TEXTURE_2D, getBackingTexture(), texture, level, internalFormat, destType);
 
-    context.pixelStorei(Extensions3D::UNPACK_FLIP_Y_CHROMIUM, false);
-    context.pixelStorei(Extensions3D::UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
+    context.pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, false);
+    context.pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
     context.flush();
     return true;
 }