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

Source/core/editing/FormatBlockCommand.cpp

 /*
  * Copyright (C) 2006 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 50 matching lines @@
 }
 
 void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<HTMLElement>& blockElement)
 {
     Element* refElement = enclosingBlockFlowElement(VisiblePosition(end));
     Element* root = editableRootForPosition(start);
     // Root is null for elements with contenteditable=false.
     if (!root || !refElement)
         return;
 
-    Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
-    RefPtrWillBeRawPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo).get();
+    Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.anchorNode());
+    RefPtrWillBeRawPtr<Node> outerBlock = (start.anchorNode() == nodeToSplitTo) ? start.anchorNode() : splitTreeToNode(start.anchorNode(), nodeToSplitTo).get();
     RefPtrWillBeRawPtr<Node> nodeAfterInsertionPosition = outerBlock;
     RefPtrWillBeRawPtr<Range> range = Range::create(document(), start, endOfSelection);
 
     if (isElementForFormatBlock(refElement->tagQName()) && VisiblePosition(start) == startOfBlock(VisiblePosition(start))
         && (VisiblePosition(end) == endOfBlock(VisiblePosition(end)) || isNodeVisiblyContainedWithin(*refElement, *range))
         && refElement != root && !root->isDescendantOf(refElement)) {
         // Already in a block element that only contains the current paragraph
         if (refElement->hasTagName(tagName()))
             return;
         nodeAfterInsertionPosition = refElement;
@@ skipping 78 matching lines @@
             return n;
         if (isBlock(n))
             lastBlock = n;
         if (isHTMLListElement(n))
             return n->parentNode()->hasEditableStyle() ? n->parentNode() : n;
     }
     return lastBlock;
 }
 
 }