Convert USERSELECT_ALL to a runtime enabled feature.

Source/core/editing/htmlediting.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 83 matching lines @@
         if (hasDescendentA)
             bias = -1;
         else if (hasDescendentB)
             bias = 1;
     }
 
     int result = Range::compareBoundaryPoints(nodeA, offsetA, nodeB, offsetB, IGNORE_EXCEPTION);
     return result ? result : bias;
 }
 
+int comparePositions(const PositionWithAffinity& a, const PositionWithAffinity& b)
+{
+    return comparePositions(a.position(), b.position());
+}
+
 int comparePositions(const VisiblePosition& a, const VisiblePosition& b)
 {
     return comparePositions(a.deepEquivalent(), b.deepEquivalent());
 }
 
 Node* highestEditableRoot(const Position& position, EditableType editableType)
 {
     Node* node = position.deprecatedNode();
     if (!node)
         return 0;
@@ skipping 1048 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 WebCore