Replace scoped_ptr with unique_ptr in talk/

talk/app/webrtc/objc/RTCMediaStreamTrack.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 14 matching lines @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "RTCEnumConverter.h"
 #import "RTCMediaStreamTrack+Internal.h"
 
+#include <memory>
+
 namespace webrtc {
 
 class RTCMediaStreamTrackObserver : public ObserverInterface {
  public:
   RTCMediaStreamTrackObserver(RTCMediaStreamTrack* track) { _track = track; }
 
   void OnChanged() override {
     [_track.delegate mediaStreamTrackDidChange:_track];
   }
 
  private:
   __weak RTCMediaStreamTrack* _track;
 };
 }
 
 @implementation RTCMediaStreamTrack {
   rtc::scoped_refptr<webrtc::MediaStreamTrackInterface> _mediaTrack;
-  rtc::scoped_ptr<webrtc::RTCMediaStreamTrackObserver> _observer;
+  std::unique_ptr<webrtc::RTCMediaStreamTrackObserver> _observer;
 }
 
 @synthesize label;
 
 - (BOOL)isEqual:(id)other {
   // Equality is purely based on the label just like the C++ implementation.
   if (self == other)
     return YES;
   if (![other isKindOfClass:[self class]] ||
       ![self isKindOfClass:[other class]]) {
@@ skipping 55 matching lines @@
 
 - (void)dealloc {
   _mediaTrack->UnregisterObserver(_observer.get());
 }
 
 - (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)mediaTrack {
   return _mediaTrack;
 }
 
 @end