Revert of Add support for multiple pixel formats in VideoFrameBuffer

webrtc/common_video/video_frame_buffer.cc

Index: webrtc/common_video/video_frame_buffer.cc
diff --git a/webrtc/common_video/video_frame_buffer.cc b/webrtc/common_video/video_frame_buffer.cc
index 0322dd1fd506027d4529464871ffbc0dca3393d1..4646bf491f9b745298c9fef6b29d9575b1f15f56 100644
--- a/webrtc/common_video/video_frame_buffer.cc
+++ b/webrtc/common_video/video_frame_buffer.cc
@@ -28,10 +28,6 @@
   RTC_DCHECK(native_handle != nullptr);
   RTC_DCHECK_GT(width, 0);
   RTC_DCHECK_GT(height, 0);
-}
-
-VideoFrameBuffer::Type NativeHandleBuffer::type() const {
-  return Type::kNative;
 }
 
 int NativeHandleBuffer::width() const {
@@ -96,10 +92,6 @@
   no_longer_used_cb_();
 }
 
-VideoFrameBuffer::Type WrappedI420Buffer::type() const {
-  return Type::kI420;
-}
-
 int WrappedI420Buffer::width() const {
   return width_;
 }
@@ -128,4 +120,13 @@
   return v_stride_;
 }
 
+void* WrappedI420Buffer::native_handle() const {
+  return nullptr;
+}
+
+rtc::scoped_refptr<VideoFrameBuffer> WrappedI420Buffer::NativeToI420Buffer() {
+  RTC_NOTREACHED();
+  return nullptr;
+}
+
 }  // namespace webrtc