Revert of Split iOS sdk in to separate targets

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCDataChannel+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/RTCDataChannel.h"
-
-#include "webrtc/api/datachannelinterface.h"
-#include "webrtc/base/scoped_ref_ptr.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface RTCDataBuffer ()
-
-/**
- * The native DataBuffer representation of this RTCDatabuffer object. This is
- * needed to pass to the underlying C++ APIs.
- */
-@property(nonatomic, readonly) const webrtc::DataBuffer *nativeDataBuffer;
-
-/** Initialize an RTCDataBuffer from a native DataBuffer. */
-- (instancetype)initWithNativeBuffer:(const webrtc::DataBuffer&)nativeBuffer;
-
-@end
-
-
-@interface RTCDataChannel ()
-
-/** Initialize an RTCDataChannel from a native DataChannelInterface. */
-- (instancetype)initWithNativeDataChannel:
-    (rtc::scoped_refptr<webrtc::DataChannelInterface>)nativeDataChannel
-    NS_DESIGNATED_INITIALIZER;
-
-+ (webrtc::DataChannelInterface::DataState)
-    nativeDataChannelStateForState:(RTCDataChannelState)state;
-
-+ (RTCDataChannelState)dataChannelStateForNativeState:
-    (webrtc::DataChannelInterface::DataState)nativeState;
-
-+ (NSString *)stringForState:(RTCDataChannelState)state;
-
-@end
-
-NS_ASSUME_NONNULL_END