Revert of Add support for multiple pixel formats in VideoFrameBuffer

webrtc/api/video/i420_buffer.cc

 /*
  *  Copyright (c) 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.
  */
 #include "webrtc/api/video/i420_buffer.h"
@@ skipping 118 matching lines @@
       static_cast<libyuv::RotationMode>(rotation)));
 
   return buffer;
 }
 
 void I420Buffer::InitializeData() {
   memset(data_.get(), 0,
          I420DataSize(height_, stride_y_, stride_u_, stride_v_));
 }
 
-VideoFrameBuffer::Type I420Buffer::type() const {
-  return Type::kI420;
-}
-
 int I420Buffer::width() const {
   return width_;
 }
 
 int I420Buffer::height() const {
   return height_;
 }
 
 const uint8_t* I420Buffer::DataY() const {
   return data_.get();
 }
 const uint8_t* I420Buffer::DataU() const {
   return data_.get() + stride_y_ * height_;
 }
 const uint8_t* I420Buffer::DataV() const {
   return data_.get() + stride_y_ * height_ + stride_u_ * ((height_ + 1) / 2);
 }
 
 int I420Buffer::StrideY() const {
   return stride_y_;
 }
 int I420Buffer::StrideU() const {
   return stride_u_;
 }
 int I420Buffer::StrideV() const {
   return stride_v_;
 }
 
+void* I420Buffer::native_handle() const {
+  return nullptr;
+}
+
+rtc::scoped_refptr<VideoFrameBuffer> I420Buffer::NativeToI420Buffer() {
+  return this;
+}
+
 uint8_t* I420Buffer::MutableDataY() {
   return const_cast<uint8_t*>(DataY());
 }
 uint8_t* I420Buffer::MutableDataU() {
   return const_cast<uint8_t*>(DataU());
 }
 uint8_t* I420Buffer::MutableDataV() {
   return const_cast<uint8_t*>(DataV());
 }
 
@@ skipping 54 matching lines @@
       src,
       (src.width() - crop_width) / 2, (src.height() - crop_height) / 2,
       crop_width, crop_height);
 }
 
 void I420Buffer::ScaleFrom(const VideoFrameBuffer& src) {
   CropAndScaleFrom(src, 0, 0, src.width(), src.height());
 }
 
 }  // namespace webrtc