Fix stats for encoder target bitrate when target rate is zero.

webrtc/modules/video_coding/include/video_coding_defines.h

Index: webrtc/modules/video_coding/include/video_coding_defines.h
diff --git a/webrtc/modules/video_coding/include/video_coding_defines.h b/webrtc/modules/video_coding/include/video_coding_defines.h
index ba71803c7c98b8632871cc879e08d46783bce8e1..e27de47ee0cb43e034f8d8debfd5877fd60b0c0e 100644
--- a/webrtc/modules/video_coding/include/video_coding_defines.h
+++ b/webrtc/modules/video_coding/include/video_coding_defines.h
@@ -126,12 +126,6 @@ class VCMProtectionCallback {
   virtual ~VCMProtectionCallback() {}
 };
 
-class VideoEncoderRateObserver {
- public:
-  virtual ~VideoEncoderRateObserver() {}
-  virtual void OnSetRates(uint32_t bitrate_bps, int framerate) = 0;
-};
-
 // Callback class used for telling the user about what frame type needed to
 // continue decoding.
 // Typically a key frame when the stream has been corrupted in some way.