Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/EXTFragDepth.h

Index: Source/core/html/canvas/EXTFragDepth.h
diff --git a/Source/core/html/canvas/EXTFragDepth.h b/Source/core/html/canvas/EXTFragDepth.h
index 57da19e2a91bd811c4231dacff183a0e3fcf2dae..3752a790e84aec9a467256cc5babcdd1f465da8e 100644
--- a/Source/core/html/canvas/EXTFragDepth.h
+++ b/Source/core/html/canvas/EXTFragDepth.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class EXTFragDepth : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<EXTFragDepth> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<EXTFragDepth> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~EXTFragDepth();
     virtual ExtensionName getName() const;
 
 private:
-    explicit EXTFragDepth(WebGLRenderingContext*);
+    explicit EXTFragDepth(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore