Reland of Split iOS sdk in to separate targets

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

-/*
- *  Copyright 2016 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/RTCRtpReceiver.h"
-
-#include "webrtc/api/rtpreceiverinterface.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-namespace webrtc {
-
-class RtpReceiverDelegateAdapter : public RtpReceiverObserverInterface {
- public:
-  RtpReceiverDelegateAdapter(RTCRtpReceiver* receiver);
-
-  void OnFirstPacketReceived(cricket::MediaType media_type) override;
-
- private:
-  __weak RTCRtpReceiver* receiver_;
-};
-
-}  // namespace webrtc
-
-@interface RTCRtpReceiver ()
-
-@property(nonatomic, readonly)
-    rtc::scoped_refptr<webrtc::RtpReceiverInterface> nativeRtpReceiver;
-
-/** Initialize an RTCRtpReceiver with a native RtpReceiverInterface. */
-- (instancetype)initWithNativeRtpReceiver:
-    (rtc::scoped_refptr<webrtc::RtpReceiverInterface>)nativeRtpReceiver
-    NS_DESIGNATED_INITIALIZER;
-
-+ (RTCRtpMediaType)mediaTypeForNativeMediaType:(cricket::MediaType)nativeMediaType;
-
-@end
-
-NS_ASSUME_NONNULL_END