Remove the concept of document.documentElement

sky/engine/public/web/WebWidget.h

Index: sky/engine/public/web/WebWidget.h
diff --git a/sky/engine/public/web/WebWidget.h b/sky/engine/public/web/WebWidget.h
index 4a394aa61b971cc8e894e1fdfa0c5d92c7fa1366..7c7fd4006a6ccf6b3aea123cb7e0a1902011edaa 100644
--- a/sky/engine/public/web/WebWidget.h
+++ b/sky/engine/public/web/WebWidget.h
@@ -111,18 +111,9 @@ public:
     // Returns true if there is an ongoing composition or the text is inserted.
     virtual bool confirmComposition(const WebString& text) = 0;
 
-    // Fetches the character range of the current composition, also called the
-    // "marked range." Returns true and fills the out-paramters on success;
-    // returns false on failure.
-    virtual bool compositionRange(size_t* location, size_t* length) = 0;
-
     // Returns information about the current text input of this WebWidget.
     virtual WebTextInputInfo textInputInfo() = 0;
 
-    // The page background color. Can be used for filling in areas without
-    // content.
-    virtual WebColor backgroundColor() const = 0;
-
 protected:
     ~WebWidget() { }
 };