Reland of Delete deprecated and transitional stuff related to video frame refactoring.

webrtc/api/video/i420_buffer.cc

Index: webrtc/api/video/i420_buffer.cc
diff --git a/webrtc/api/video/i420_buffer.cc b/webrtc/api/video/i420_buffer.cc
index 81f57898372365a5ffff51fe7c95af37782eff53..32c73eac67de98c822bcb818642e1d7d5fa9799b 100644
--- a/webrtc/api/video/i420_buffer.cc
+++ b/webrtc/api/video/i420_buffer.cc
@@ -131,17 +131,6 @@
   return buffer;
 }
 
-// static
-rtc::scoped_refptr<VideoFrameBuffer> I420Buffer::Rotate(
-    rtc::scoped_refptr<VideoFrameBuffer> src,
-    VideoRotation rotation) {
-  if (rotation == webrtc::kVideoRotation_0) {
-    return src;
-  } else {
-    return Rotate(*src, rotation);
-  }
-}
-
 void I420Buffer::InitializeData() {
   memset(data_.get(), 0,
          I420DataSize(height_, stride_y_, stride_u_, stride_v_));