Rename ShadowDescendant to ShadowPseudo.

Source/core/css/CSSSelector.h

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 61 matching lines @@
             End, // css3: E[foo$="bar"]
             PagePseudoClass
         };
 
         enum Relation {
             Descendant = 0,
             Child,
             DirectAdjacent,
             IndirectAdjacent,
             SubSelector,
-            ShadowDescendant,
+            ShadowPseudo,
             ShadowDistributed
         };
 
         enum PseudoType {
             PseudoNotParsed = 0,
             PseudoUnknown,
             PseudoEmpty,
             PseudoFirstChild,
             PseudoFirstOfType,
             PseudoLastChild,
@@ skipping 340 matching lines @@
     ASSERT(m_match != Tag);
     // AtomicString is really just an AtomicStringImpl* so the cast below is safe.
     // FIXME: Perhaps call sites could be changed to accept AtomicStringImpl?
     return *reinterpret_cast<const AtomicString*>(m_hasRareData ? &m_data.m_rareData->m_value : &m_data.m_value);
 }
 
 
 } // namespace WebCore
 
 #endif // CSSSelector_h