Introduce rootEditableElementOrTreeScopeRootNodeOf() as replacement of FrameSelection member

third_party/WebKit/Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 121 matching lines @@
 const SelectionInDOMTree& FrameSelection::selectionInDOMTree() const {
   return m_selectionEditor->selectionInDOMTree();
 }
 
 Element* FrameSelection::rootEditableElementOrDocumentElement() const {
   Element* selectionRoot =
       computeVisibleSelectionInDOMTreeDeprecated().rootEditableElement();
   return selectionRoot ? selectionRoot : document().documentElement();
 }
 
-ContainerNode* FrameSelection::rootEditableElementOrTreeScopeRootNode() const {
-  Element* selectionRoot =
-      computeVisibleSelectionInDOMTreeDeprecated().rootEditableElement();
+// TODO(yosin): We should move |rootEditableElementOrTreeScopeRootNodeOf()| to
+// "EditingUtilities.cpp"
+ContainerNode* rootEditableElementOrTreeScopeRootNodeOf(
+    const VisibleSelection& visibleSelection) {
+  Element* selectionRoot = visibleSelection.rootEditableElement();
   if (selectionRoot)
     return selectionRoot;
 
-  Node* node = computeVisibleSelectionInDOMTreeDeprecated()
-                   .base()
-                   .computeContainerNode();
+  Node* const node = visibleSelection.base().computeContainerNode();
   return node ? &node->treeScope().rootNode() : 0;
 }
 
 const VisibleSelection&
 FrameSelection::computeVisibleSelectionInDOMTreeDeprecated() const {
   // TODO(yosin): We should hoist updateStyleAndLayoutIgnorePendingStylesheets
   // to caller. See http://crbug.com/590369 for more details.
   document().updateStyleAndLayoutIgnorePendingStylesheets();
   return computeVisibleSelectionInDOMTree();
 }
@@ skipping 1016 matching lines @@
 }
 
 void showTree(const blink::FrameSelection* sel) {
   if (sel)
     sel->showTreeForThis();
   else
     LOG(INFO) << "Cannot showTree for <null> FrameSelection.";
 }
 
 #endif