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

webrtc/api/video/i420_buffer.h

Index: webrtc/api/video/i420_buffer.h
diff --git a/webrtc/api/video/i420_buffer.h b/webrtc/api/video/i420_buffer.h
index 388a3dd76903ad9e8f24a7d841f6220c2d994a21..507bd0571b303f0238a7f2b03631336aaf5f8e82 100644
--- a/webrtc/api/video/i420_buffer.h
+++ b/webrtc/api/video/i420_buffer.h
@@ -53,9 +53,6 @@
   // are resolved in a better way. Or in the mean time, use SetBlack.
   void InitializeData();
 
-  // TODO(nisse): Deprecated, use static method instead.
-  void SetToBlack() { SetBlack(this); }
-
   int width() const override;
   int height() const override;
   const uint8_t* DataY() const override;
@@ -88,14 +85,6 @@
   // Scale all of |src| to the size of |this| buffer, with no cropping.
   void ScaleFrom(const VideoFrameBuffer& src);
 
-  // TODO(nisse): Deprecated, delete once downstream applications are updated.
-  // Returns a rotated versions of |src|. Native buffers are not
-  // supported. The reason this function doesn't return an I420Buffer,
-  // is that it returns |src| unchanged in case |rotation| is zero.
-  static rtc::scoped_refptr<VideoFrameBuffer> Rotate(
-      rtc::scoped_refptr<VideoFrameBuffer> src,
-      VideoRotation rotation);
-
  protected:
   I420Buffer(int width, int height);
   I420Buffer(int width, int height, int stride_y, int stride_u, int stride_v);