Introduce rootEditableElementOrTreeScopeRootNodeOf() as replacement of FrameSelection member

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 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
@@ skipping 83 matching lines @@
   static inline EUserTriggered selectionOptionsToUserTriggered(
       SetSelectionOptions options) {
     return static_cast<EUserTriggered>(options & UserTriggered);
   }
 
   bool isAvailable() const { return lifecycleContext(); }
   // You should not call |document()| when |!isAvailable()|.
   Document& document() const;
   LocalFrame* frame() const { return m_frame; }
   Element* rootEditableElementOrDocumentElement() const;
-  ContainerNode* rootEditableElementOrTreeScopeRootNode() const;
 
   // An implementation of |WebFrame::moveCaretSelection()|
   void moveCaretSelection(const IntPoint&);
 
   const VisibleSelection& computeVisibleSelectionInDOMTree() const;
   const VisibleSelectionInFlatTree& computeVisibleSelectionInFlatTree() const;
 
   // TODO(editing-dev): We should replace
   // |computeVisibleSelectionInDOMTreeDeprecated()| with update layout and
   // |computeVisibleSelectionInDOMTree()| to increase places hoisting update
@@ skipping 209 matching lines @@
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif  // FrameSelection_h