Add #include <algorithm> to code that is missing it.

Source/wtf/RetainPtr.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2010 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.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Library General Public License for more details.
  *
  *  You should have received a copy of the GNU Library General Public License
  *  along with this library; see the file COPYING.LIB.  If not, write to
  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  *  Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef RetainPtr_h
 #define RetainPtr_h
 
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/HashTraits.h"
 #include "wtf/NullPtr.h"
 #include "wtf/TypeTraits.h"
 #include <algorithm>
+#include <utility>
 
 #if USE(CF)
 #include <CoreFoundation/CoreFoundation.h>
 #endif
 
 #ifdef __OBJC__
 #import <Foundation/Foundation.h>
 #endif
 
 #ifndef CF_RELEASES_ARGUMENT
@@ skipping 255 matching lines @@
 } // namespace WTF
 
 using WTF::AdoptCF;
 using WTF::AdoptNS;
 using WTF::adoptCF;
 using WTF::adoptNS;
 using WTF::RetainPtr;
 using WTF::retainPtr;
 
 #endif // WTF_RetainPtr_h