Unify the macOS and iOS capturer implementations

webrtc/modules/video_capture/ios/device_info_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_DEVICE_INFO_IOS_OBJC_H_
-#define WEBRTC_MODULES_VIDEO_CAPTURE_IOS_DEVICE_INFO_IOS_OBJC_H_
-
-#import <AVFoundation/AVFoundation.h>
-
-#include "webrtc/modules/video_capture/video_capture_defines.h"
-
-@interface DeviceInfoIosObjC : NSObject
-+ (int)captureDeviceCount;
-+ (AVCaptureDevice*)captureDeviceForIndex:(int)index;
-+ (AVCaptureDevice*)captureDeviceForUniqueId:(NSString*)uniqueId;
-+ (NSString*)deviceNameForIndex:(int)index;
-+ (NSString*)deviceUniqueIdForIndex:(int)index;
-+ (NSString*)deviceNameForUniqueId:(NSString*)uniqueId;
-+ (webrtc::VideoCaptureCapability)capabilityForPreset:(NSString*)preset;
-
-@end
-
-#endif  // WEBRTC_MODULES_VIDEO_CAPTURE_IOS_DEVICE_INFO_IOS_OBJC_H_