Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLCompressedTexturePVRTC.h

Index: Source/core/html/canvas/WebGLCompressedTexturePVRTC.h
diff --git a/Source/core/html/canvas/WebGLCompressedTexturePVRTC.h b/Source/core/html/canvas/WebGLCompressedTexturePVRTC.h
index 8e1330bdf63c627e3b550a3d44f865e6b7fbde64..805ec9e00420eeb01177e7680ee9ae08cfb479dc 100644
--- a/Source/core/html/canvas/WebGLCompressedTexturePVRTC.h
+++ b/Source/core/html/canvas/WebGLCompressedTexturePVRTC.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class WebGLCompressedTexturePVRTC : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLCompressedTexturePVRTC> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<WebGLCompressedTexturePVRTC> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~WebGLCompressedTexturePVRTC();
     virtual ExtensionName getName() const;
 
 private:
-    WebGLCompressedTexturePVRTC(WebGLRenderingContext*);
+    WebGLCompressedTexturePVRTC(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore