Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/OESTextureHalfFloatLinear.h

Index: Source/core/html/canvas/OESTextureHalfFloatLinear.h
diff --git a/Source/core/html/canvas/OESTextureHalfFloatLinear.h b/Source/core/html/canvas/OESTextureHalfFloatLinear.h
index 0258535602c23dd56ed3fe0fa2aa34ca3105ce76..3ef5ed8b373a8ca828cbdda3a64e2e2f6e2dd70a 100644
--- a/Source/core/html/canvas/OESTextureHalfFloatLinear.h
+++ b/Source/core/html/canvas/OESTextureHalfFloatLinear.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class OESTextureHalfFloatLinear : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<OESTextureHalfFloatLinear> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<OESTextureHalfFloatLinear> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~OESTextureHalfFloatLinear();
     virtual ExtensionName getName() const;
 
 private:
-    OESTextureHalfFloatLinear(WebGLRenderingContext*);
+    OESTextureHalfFloatLinear(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore