Revert of Remove webrtc/base/scoped_ptr.h

webrtc/sdk/objc/Framework/Classes/RTCMediaStreamTrack+Private.h

 /*
  *  Copyright 2015 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.
  */
 
 #import "WebRTC/RTCMediaStreamTrack.h"
 
 #include "webrtc/api/mediastreaminterface.h"
+#include "webrtc/base/scoped_ptr.h"
 
 typedef NS_ENUM(NSInteger, RTCMediaStreamTrackType) {
   RTCMediaStreamTrackTypeAudio,
   RTCMediaStreamTrackTypeVideo,
 };
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface RTCMediaStreamTrack ()
 
@@ skipping 21 matching lines @@
     (RTCMediaStreamTrackState)state;
 
 + (RTCMediaStreamTrackState)trackStateForNativeState:
     (webrtc::MediaStreamTrackInterface::TrackState)nativeState;
 
 + (NSString *)stringForState:(RTCMediaStreamTrackState)state;
 
 @end
 
 NS_ASSUME_NONNULL_END