Update I420Buffer to new VideoFrameBuffer interface

webrtc/api/video/video_frame.h

 /*
  *  Copyright (c) 2014 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 80 matching lines @@
   // TODO(nisse): Deprecated. Migrate all users to timestamp_us().
   int64_t render_time_ms() const;
 
   // Return the underlying buffer. Never nullptr for a properly
   // initialized VideoFrame.
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> video_frame_buffer() const;
 
   // TODO(nisse): Deprecated.
   // Return true if the frame is stored in a texture.
   bool is_texture() const {
-    return video_frame_buffer()->native_handle() != nullptr;
+    return video_frame_buffer()->type() == VideoFrameBuffer::Type::kNative;
   }
 
  private:
   // An opaque reference counted handle that stores the pixel data.
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> video_frame_buffer_;
   uint32_t timestamp_rtp_;
   int64_t ntp_time_ms_;
   int64_t timestamp_us_;
   VideoRotation rotation_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_VIDEO_VIDEO_FRAME_H_