Revert of Unify the macOS and iOS capturer implementations

webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.h

+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CAPTURE_IOS_VIDEO_CAPTURE_IOS_OBJC_H_
+#define WEBRTC_MODULES_VIDEO_CAPTURE_IOS_VIDEO_CAPTURE_IOS_OBJC_H_
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+#include "webrtc/modules/video_capture/ios/video_capture_ios.h"
+
+// The following class listens to a notification with name:
+// 'StatusBarOrientationDidChange'.
+// This notification must be posted in order for the capturer to reflect the
+// orientation change in video w.r.t. the application orientation.
+@interface RTCVideoCaptureIosObjC
+    : NSObject<AVCaptureVideoDataOutputSampleBufferDelegate>
+
+@property webrtc::VideoRotation frameRotation;
+
+// custom initializer. Instance of VideoCaptureIos is needed
+// for callback purposes.
+// default init methods have been overridden to return nil.
+- (id)initWithOwner:(webrtc::videocapturemodule::VideoCaptureIos*)owner
+          captureId:(int)captureId;
+- (BOOL)setCaptureDeviceByUniqueId:(NSString*)uniqueId;
+- (BOOL)startCaptureWithCapability:
+        (const webrtc::VideoCaptureCapability&)capability;
+- (BOOL)stopCapture;
+
+@end
+#endif  // WEBRTC_MODULES_VIDEO_CAPTURE_IOS_VIDEO_CAPTURE_IOS_OBJC_H_