Revert of Remove webrtc/base/scoped_ptr.h

webrtc/libjingle/xmllite/xmlnsstack.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_LIBJINGLE_XMLLITE_XMLNSSTACK_H_
 #define WEBRTC_LIBJINGLE_XMLLITE_XMLNSSTACK_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 #include "webrtc/libjingle/xmllite/qname.h"
+#include "webrtc/base/scoped_ptr.h"
 
 namespace buzz {
 
 class XmlnsStack {
 public:
   XmlnsStack();
   ~XmlnsStack();
 
   void AddXmlns(const std::string& prefix, const std::string& ns);
   void RemoveXmlns();
   void PushFrame();
   void PopFrame();
   void Reset();
 
   std::pair<std::string, bool> NsForPrefix(const std::string& prefix);
   bool PrefixMatchesNs(const std::string & prefix, const std::string & ns);
   std::pair<std::string, bool> PrefixForNs(const std::string& ns, bool isAttr);
   std::pair<std::string, bool> AddNewPrefix(const std::string& ns, bool isAttr);
   std::string FormatQName(const QName & name, bool isAttr);
 
 private:
 
   std::unique_ptr<std::vector<std::string> > pxmlnsStack_;
   std::unique_ptr<std::vector<size_t> > pxmlnsDepthStack_;
 };
 }
 
 #endif  // WEBRTC_LIBJINGLE_XMLLITE_XMLNSSTACK_H_