Convert USERSELECT_ALL to a runtime enabled feature.

Source/core/dom/Position.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 171 matching lines @@
     bool isRenderedCharacter() const;
     bool rendersInDifferentPosition(const Position&) const;
 
     void getInlineBoxAndOffset(EAffinity, InlineBox*&, int& caretOffset) const;
     void getInlineBoxAndOffset(EAffinity, TextDirection primaryDirection, InlineBox*&, int& caretOffset) const;
 
     TextDirection primaryDirection() const;
 
     static bool hasRenderedNonAnonymousDescendantsWithHeight(RenderObject*);
     static bool nodeIsUserSelectNone(Node*);
-#if ENABLE(USERSELECT_ALL)
     static bool nodeIsUserSelectAll(const Node*);
     static Node* rootUserSelectAllForNode(Node*);
-#endif
+
     static ContainerNode* findParent(const Node*);
 
     void debugPosition(const char* msg = "") const;
 
 #ifndef NDEBUG
     void formatForDebugger(char* buffer, unsigned length) const;
     void showAnchorTypeAndOffset() const;
     void showTreeForThis() const;
 #endif
 
@@ skipping 134 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Position&);
 void showTree(const WebCore::Position*);
 #endif
 
 #endif // Position_h