Reland of Deprecate VCMPacketizationCallback::SendData and use EncodedImageCallback instead.

webrtc/video_encoder.h

Index: webrtc/video_encoder.h
diff --git a/webrtc/video_encoder.h b/webrtc/video_encoder.h
index 89a6464b7c1c4b49ae5e45d15d8a9f19f33a9825..8c82753d107aab7c9773a625fc6167428b52926d 100644
--- a/webrtc/video_encoder.h
+++ b/webrtc/video_encoder.h
@@ -31,6 +31,7 @@
   virtual ~EncodedImageCallback() {}
 
   // Callback function which is called when an image has been encoded.
+  // TODO(perkj): Change this to return void.
   virtual int32_t Encoded(const EncodedImage& encoded_image,
                           const CodecSpecificInfo* codec_specific_info,
                           const RTPFragmentationHeader* fragmentation) = 0;