ObjC: Remove RTCVideoFrame.nativeHandle

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

Index: webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm
index daac9fde08cbba6a27250894e190e3a297a6613a..ca02eb370667255b000d6ea0e86d8f052a6a716f 100644
--- a/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm
+++ b/webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoFrame.mm
@@ -83,14 +83,6 @@
   return _timeStampNs;
 }
 
-- (CVPixelBufferRef)nativeHandle {
-  if ([_buffer isKindOfClass:[RTCCVPixelBuffer class]]) {
-    return ((RTCCVPixelBuffer *)_buffer).pixelBuffer;
-  } else {
-    return nullptr;
-  }
-}
-
 - (RTCVideoFrame *)newI420VideoFrame {
   return [[RTCVideoFrame alloc] initWithBuffer:[_buffer toI420]
                                       rotation:_rotation