Remove mutable from members in CSSSelector.

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 288 matching lines @@
         enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
         unsigned computeLinkMatchType() const;
 
         bool isForPage() const { return m_isForPage; }
         void setForPage() { m_isForPage = true; }
 
         bool relationIsAffectedByPseudoContent() const { return m_relationIsAffectedByPseudoContent; }
         void setRelationIsAffectedByPseudoContent() { m_relationIsAffectedByPseudoContent = true; }
 
     private:
-        unsigned m_relation           : 3; // enum Relation
-        mutable unsigned m_match      : 4; // enum Match
-        mutable unsigned m_pseudoType : 8; // PseudoType
+        unsigned m_relation               : 3; // enum Relation
+        unsigned m_match                  : 4; // enum Match
+        unsigned m_pseudoType             : 8; // enum PseudoType
         unsigned m_isLastInSelectorList   : 1;
         unsigned m_isLastInTagHistory     : 1;
         unsigned m_hasRareData            : 1;
         unsigned m_isForPage              : 1;
         unsigned m_tagIsImplicit          : 1;
         unsigned m_relationIsAffectedByPseudoContent  : 1;
 
         void setPseudoType(PseudoType pseudoType)
         {
             m_pseudoType = pseudoType;
@@ skipping 158 matching lines @@
     if (m_hasRareData)
         return m_data.m_rareData->m_value;
     // AtomicString is really just a StringImpl* so the cast below is safe.
     // FIXME: Perhaps call sites could be changed to accept StringImpl?
     return *reinterpret_cast<const AtomicString*>(&m_data.m_value);
 }
 
 } // namespace blink
 
 #endif // CSSSelector_h