Replace scoped_ptr with unique_ptr in webrtc/voice_engine/

webrtc/voice_engine/network_predictor.h

 /*
  *  Copyright (c) 2014 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_VOICE_ENGINE_NETWORK_PREDICTOR_H_
 #define WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_
 
+#include <memory>
+
 #include "webrtc/base/exp_filter.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
 
 namespace voe {
 
 // NetworkPredictor is to predict network conditions e.g., packet loss rate, for
 // sender and/or receiver to cope with changes in the network condition.
 class NetworkPredictor {
  public:
   explicit NetworkPredictor(Clock* clock);
   ~NetworkPredictor() {}
 
   // Gets the predicted packet loss rate.
   uint8_t GetLossRate();
 
   // Updates the packet loss rate predictor, on receiving a new observation of
   // packet loss rate from past. Input packet loss rate should be in the
   // interval [0, 255].
   void UpdatePacketLossRate(uint8_t loss_rate);
 
  private:
   Clock* clock_;
   int64_t last_loss_rate_update_time_ms_;
 
   // An exponential filter is used to predict packet loss rate.
-  rtc::scoped_ptr<rtc::ExpFilter> loss_rate_filter_;
+  std::unique_ptr<rtc::ExpFilter> loss_rate_filter_;
 };
 
 }  // namespace voe
 }  // namespace webrtc
 #endif  // WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_