[CodeHealth] Use Position::anchorNode instead of deprecatedNode.

Source/core/editing/VisiblePosition.h

 /*
  * Copyright (C) 2004, 2008 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 70 matching lines @@
     VisiblePosition skipToStartOfEditingBoundary(const VisiblePosition&) const;
     VisiblePosition skipToEndOfEditingBoundary(const VisiblePosition&) const;
 
     VisiblePosition left(bool stayInEditableContent = false) const;
     VisiblePosition right(bool stayInEditableContent = false) const;
 
     UChar32 characterAfter() const;
     UChar32 characterBefore() const { return previous().characterAfter(); }
 
     // FIXME: This does not handle [table, 0] correctly.
-    Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.deprecatedNode()->rootEditableElement() : 0; }
+    Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.anchorNode()->rootEditableElement() : 0; }
 
     InlineBoxPosition computeInlineBoxPosition() const
     {
         return m_deepPosition.computeInlineBoxPosition(m_affinity);
     }
 
     // Rect is local to the returned layoutObject
     LayoutRect localCaretRect(LayoutObject*&) const;
     // Bounds of (possibly transformed) caret in absolute coords
     IntRect absoluteCaretBounds() const;
@@ skipping 48 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::VisiblePosition*);
 void showTree(const blink::VisiblePosition&);
 #endif
 
 #endif // VisiblePosition_h