Remove the concept of document.documentElement

sky/engine/web/WebRange.cpp

Index: sky/engine/web/WebRange.cpp
diff --git a/sky/engine/web/WebRange.cpp b/sky/engine/web/WebRange.cpp
index 6de48a2016ecc4827047c1c58719dffa89963c8f..08ac78be14dee66121436a7078aa46dc7b104f46 100644
--- a/sky/engine/web/WebRange.cpp
+++ b/sky/engine/web/WebRange.cpp
@@ -101,8 +101,8 @@ WebRange WebRange::expandedToParagraph() const
 WebRange WebRange::fromDocumentRange(WebLocalFrame* frame, int start, int length)
 {
     LocalFrame* webFrame = toWebLocalFrameImpl(frame)->frame();
-    Element* selectionRoot = webFrame->selection().rootEditableElement();
-    ContainerNode* scope = selectionRoot ? selectionRoot : webFrame->document()->documentElement();
+    ContainerNode* selectionRoot = webFrame->selection().rootEditableElement();
+    ContainerNode* scope = selectionRoot ? selectionRoot : webFrame->document();
     return PlainTextRange(start, start + length).createRange(*scope);
 }