ObjC: Remove RTCVideoFrame I420 functions

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm

 /*
  *  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.
  */
 
@@ skipping 13 matching lines @@
 }
 
 - (int)height {
   return _buffer.height;
 }
 
 - (RTCVideoRotation)rotation {
   return _rotation;
 }
 
-- (const uint8_t *)dataY {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).dataY;
-  } else {
-    return nullptr;
-  }
-}
-
-- (const uint8_t *)dataU {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).dataU;
-  } else {
-    return nullptr;
-  }
-}
-
-- (const uint8_t *)dataV {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).dataV;
-  } else {
-    return nullptr;
-  }
-}
-
-- (int)strideY {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).strideY;
-  } else {
-    return 0;
-  }
-}
-
-- (int)strideU {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).strideU;
-  } else {
-    return 0;
-  }
-}
-
-- (int)strideV {
-  if ([_buffer conformsToProtocol:@protocol(RTCI420Buffer)]) {
-    return ((id<RTCI420Buffer>)_buffer).strideV;
-  } else {
-    return 0;
-  }
-}
-
 - (int64_t)timeStampNs {
   return _timeStampNs;
 }
 
 - (CVPixelBufferRef)nativeHandle {
   if ([_buffer isKindOfClass:[RTCCVPixelBuffer class]]) {
     return ((RTCCVPixelBuffer *)_buffer).pixelBuffer;
   } else {
     return nullptr;
   }
@@ skipping 38 matching lines @@
   if (self = [super init]) {
     _buffer = buffer;
     _rotation = rotation;
     _timeStampNs = timeStampNs;
   }
 
   return self;
 }
 
 @end