Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLDepthTexture.h

Index: Source/core/html/canvas/WebGLDepthTexture.h
diff --git a/Source/core/html/canvas/WebGLDepthTexture.h b/Source/core/html/canvas/WebGLDepthTexture.h
index 75ee15f0d2be3ca254f6e26491f42ceaf4af7da8..3cd8c7920afb74a69c2dccc5e2e17f0fc3130040 100644
--- a/Source/core/html/canvas/WebGLDepthTexture.h
+++ b/Source/core/html/canvas/WebGLDepthTexture.h
@@ -34,15 +34,15 @@ namespace WebCore {
 
 class WebGLDepthTexture : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<WebGLDepthTexture> create(WebGLRenderingContext*);
-    static bool supported(WebGLRenderingContext*);
+    static PassRefPtr<WebGLDepthTexture> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
     static const char* getExtensionName();
 
     virtual ~WebGLDepthTexture();
-    virtual ExtensionName getName() const;
+    virtual WebGLExtensionName getName() const;
 
 private:
-    WebGLDepthTexture(WebGLRenderingContext*);
+    WebGLDepthTexture(WebGLRenderingContextBase*);
 };
 
 } // namespace WebCore