Move a static member function nodeIsUserSelectNone() out from PositionAlgorithm template class

Source/core/editing/EditingUtilities.h

 /*
  * Copyright (C) 2004, 2006, 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 123 matching lines @@
 bool isEmptyTableCell(const Node*);
 bool isTableStructureNode(const Node*);
 bool isHTMLListElement(Node*);
 bool isListItem(const Node*);
 bool isNodeRendered(const Node&);
 bool isNodeVisiblyContainedWithin(Node&, const Range&);
 bool isRenderedAsNonInlineTableImageOrHR(const Node*);
 bool areIdenticalElements(const Node*, const Node*);
 bool isNonTableCellHTMLBlockElement(const Node*);
 bool isBlockFlowElement(const Node&);
+bool nodeIsUserSelectNone(Node*);
 TextDirection directionOfEnclosingBlock(const Position&);
 CORE_EXPORT TextDirection primaryDirectionOf(const Node&);
 
 // -------------------------------------------------------------------------
 // Position
 // -------------------------------------------------------------------------
 
 // Functions returning Position
 
 Position nextCandidate(const Position&);
@@ skipping 132 matching lines @@
     // FIXME: this is required until 6853027 is fixed and text checking can do this for us.
     return character == '\'' || character == rightSingleQuotationMarkCharacter || character == hebrewPunctuationGershayimCharacter;
 }
 
 String stringWithRebalancedWhitespace(const String&, bool startIsStartOfParagraph, bool endIsEndOfParagraph);
 const String& nonBreakingSpaceString();
 
 }
 
 #endif