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

Source/core/editing/BreakBlockquoteCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, 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 88 matching lines @@
     // Don't move a line break just after the caret.  Doing so would create an extra, empty paragraph
     // in the new blockquote.
     if (lineBreakExistsAtVisiblePosition(visiblePos))
         pos = pos.next();
 
     // Adjust the position so we don't split at the beginning of a quote.
     while (isFirstVisiblePositionInNode(VisiblePosition(pos), toHTMLQuoteElement(enclosingNodeOfType(pos, isMailHTMLBlockquoteElement))))
         pos = pos.previous();
 
     // startNode is the first node that we need to move to the new blockquote.
-    Node* startNode = pos.deprecatedNode();
+    Node* startNode = pos.anchorNode();
     ASSERT(startNode);
 
     // Split at pos if in the middle of a text node.
     if (startNode->isTextNode()) {
         Text* textNode = toText(startNode);
         if ((unsigned)pos.deprecatedEditingOffset() >= textNode->length()) {
             startNode = NodeTraversal::next(*startNode);
             ASSERT(startNode);
         } else if (pos.deprecatedEditingOffset() > 0)
             splitTextNode(textNode, pos.deprecatedEditingOffset());
@@ skipping 62 matching lines @@
 
     // Make sure the cloned block quote renders.
     addBlockPlaceholderIfNeeded(clonedBlockquote.get());
 
     // Put the selection right before the break.
     setEndingSelection(VisibleSelection(positionBeforeNode(breakElement.get()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }
 
 } // namespace blink