Revert of Cleanups in cricket::VideoFrame and cricket::WebRtcVideoFrame.

webrtc/media/base/videoframe.h

Index: webrtc/media/base/videoframe.h
diff --git a/webrtc/media/base/videoframe.h b/webrtc/media/base/videoframe.h
index ef43f5222994d3ed3d363d67e640c8518705bcb5..4015f906f93c4ee0894d7a7167f4d62bf1b7b7bb 100644
--- a/webrtc/media/base/videoframe.h
+++ b/webrtc/media/base/videoframe.h
@@ -75,6 +75,14 @@
                        int h,
                        const uint8_t* sample,
                        size_t sample_size);
+
+ protected:
+  // Creates an empty frame.
+  virtual VideoFrame* CreateEmptyFrame(int w,
+                                       int h,
+                                       int64_t timestamp_us) const = 0;
+
+  virtual void set_rotation(webrtc::VideoRotation rotation) = 0;
 };
 
 }  // namespace cricket