Revert of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu std::unique_ptr.

webrtc/api/statstypes.h

 /*
  *  Copyright 2012 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.
  */
 
 // This file contains structures used for retrieving statistics from an ongoing
 // libjingle session.
 
 #ifndef WEBRTC_API_STATSTYPES_H_
 #define WEBRTC_API_STATSTYPES_H_
 
 #include <algorithm>
 #include <list>
 #include <map>
 #include <string>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/base/common.h"
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/base/linked_ptr.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/base/stringencode.h"
 #include "webrtc/base/thread_checker.h"
 
 namespace webrtc {
 
 class StatsReport {
  public:
   // Indicates whether a track is for sending or receiving.
@@ skipping 278 matching lines @@
       const char* static_string_;
       Id* id_;
     } value_;
 
    private:
     RTC_DISALLOW_COPY_AND_ASSIGN(Value);
   };
 
   // TODO(tommi): Consider using a similar approach to how we store Ids using
   // scoped_refptr for values.
-  typedef std::unique_ptr<Value> ValuePtr;
+  typedef rtc::linked_ptr<Value> ValuePtr;
   typedef std::map<StatsValueName, ValuePtr> Values;
 
   // Ownership of |id| is passed to |this|.
   explicit StatsReport(const Id& id);
 
   // Factory functions for various types of stats IDs.
   static Id NewBandwidthEstimationId();
   static Id NewTypedId(StatsType type, const std::string& id);
   static Id NewTypedIntId(StatsType type, int id);
   static Id NewIdWithDirection(
@@ skipping 68 matching lines @@
   StatsReport* Find(const StatsReport::Id& id);
 
  private:
   Container list_;
   rtc::ThreadChecker thread_checker_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_STATSTYPES_H_