Revert of Add metal view, shaders and renderer.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h

Index: webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h
deleted file mode 100644
index 681c457516fdf040770904207659cb55be46ba0d..0000000000000000000000000000000000000000
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- *  Copyright 2017 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 <Foundation/Foundation.h>
-
-#import "WebRTC/RTCVideoRenderer.h"
-
-NS_ASSUME_NONNULL_BEGIN
-RTC_EXPORT
-
-/**
- * RTCMTLVideoView is thin wrapper around MTKView.
- *
- * It has id<RTCVideoRenderer> property that renders video frames in the view's
- * bounds using Metal.
- */
-NS_CLASS_AVAILABLE_IOS(9)
-@interface RTCMTLVideoView : UIView <RTCVideoRenderer>
-
-@end
-NS_ASSUME_NONNULL_END