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

Source/core/editing/EditingUtilities.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 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 527 matching lines @@
             return toElement(n);
     }
     return 0;
 }
 
 bool inSameContainingBlockFlowElement(Node* a, Node* b)
 {
     return a && b && enclosingBlockFlowElement(*a) == enclosingBlockFlowElement(*b);
 }
 
+bool nodeIsUserSelectNone(Node* node)
+{
+    return node && node->layoutObject() && !node->layoutObject()->isSelectable();
+}
+
 TextDirection directionOfEnclosingBlock(const Position& position)
 {
     Element* enclosingBlockElement = enclosingBlock(position.computeContainerNode());
     if (!enclosingBlockElement)
         return LTR;
     LayoutObject* layoutObject = enclosingBlockElement->layoutObject();
     return layoutObject ? layoutObject->style()->direction() : LTR;
 }
 
 TextDirection primaryDirectionOf(const Node& node)
@@ skipping 876 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace blink