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

Source/wtf/OwnPtr.h

 /*
  *  Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *  Copyright (C) 2013 Intel Corporation. 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 WTF_OwnPtr_h
 #define WTF_OwnPtr_h
 
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/NullPtr.h"
 #include "wtf/OwnPtrCommon.h"
 #include <algorithm>
+#include <utility>
 
 namespace WTF {
 
     template<typename T> class PassOwnPtr;
 
     template<typename T> class OwnPtr {
         WTF_MAKE_NONCOPYABLE(OwnPtr);
     public:
         typedef typename RemoveExtent<T>::Type ValueType;
         typedef ValueType* PtrType;
@@ skipping 176 matching lines @@
     template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
     {
         return p.get();
     }
 
 } // namespace WTF
 
 using WTF::OwnPtr;
 
 #endif // WTF_OwnPtr_h