PacketBuffer is now ref counted.

webrtc/modules/video_coding/rtp_frame_reference_finder.h

Index: webrtc/modules/video_coding/rtp_frame_reference_finder.h
diff --git a/webrtc/modules/video_coding/rtp_frame_reference_finder.h b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
index a12d6d8fcaaa1354c75b1180b351b3b922dd66b4..a812303b7ea85eea4e1a02992322f22473743367 100644
--- a/webrtc/modules/video_coding/rtp_frame_reference_finder.h
+++ b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
@@ -26,8 +26,16 @@
 namespace webrtc {
 namespace video_coding {
 
+class FrameObject;
 class RtpFrameObject;
-class OnCompleteFrameCallback;
+
+// A complete frame is a frame which has received all its packets and all its
+// references are known.
+class OnCompleteFrameCallback {
+ public:
+  virtual ~OnCompleteFrameCallback() {}
+  virtual void OnCompleteFrame(std::unique_ptr<FrameObject> frame) = 0;
+};
 
 class RtpFrameReferenceFinder {
  public: