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 c817d7beb3b4ec61eceb979b935002aea79d0daa..421bbbca4d07662ed9364f0d9c2b652bc69931fd 100644
--- a/Source/core/html/canvas/OESTextureHalfFloatLinear.h
+++ b/Source/core/html/canvas/OESTextureHalfFloatLinear.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class OESTextureHalfFloatLinear FINAL : 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* extensionName();
 
     virtual ~OESTextureHalfFloatLinear();
-    virtual ExtensionName name() const OVERRIDE;
+    virtual WebGLExtensionName name() const OVERRIDE;
 
 private:
-    OESTextureHalfFloatLinear(WebGLRenderingContext*);
+    OESTextureHalfFloatLinear(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore