Move talk/app/webrtc to webrtc/api

webrtc/api/objc/RTCMediaStream+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 "RTCMediaStream.h"
 
-#include "talk/app/webrtc/mediastreaminterface.h"
+#include "webrtc/api/mediastreaminterface.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface RTCMediaStream ()
 
 /**
  * MediaStreamInterface representation of this RTCMediaStream object. This is
  * needed to pass to the underlying C++ APIs.
  */
 @property(nonatomic, readonly)
     rtc::scoped_refptr<webrtc::MediaStreamInterface> nativeMediaStream;
 
 /** Initialize an RTCMediaStream from a native MediaStreamInterface. */
 - (instancetype)initWithNativeMediaStream:
     (rtc::scoped_refptr<webrtc::MediaStreamInterface>)nativeMediaStream;
 
 @end
 
 NS_ASSUME_NONNULL_END