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

webrtc/modules/video_coding/generic_encoder.cc

Index: webrtc/modules/video_coding/generic_encoder.cc
diff --git a/webrtc/modules/video_coding/generic_encoder.cc b/webrtc/modules/video_coding/generic_encoder.cc
index 0cc3d89a85a7a01c9ca968da38f7759f12a3f511..e63da026fe1dcf066f133fc282c162238d282150 100644
--- a/webrtc/modules/video_coding/generic_encoder.cc
+++ b/webrtc/modules/video_coding/generic_encoder.cc
@@ -23,11 +23,9 @@
 namespace webrtc {
 VCMGenericEncoder::VCMGenericEncoder(
     VideoEncoder* encoder,
-    VideoEncoderRateObserver* rate_observer,
     VCMEncodedFrameCallback* encoded_frame_callback,
     bool internal_source)
     : encoder_(encoder),
-      rate_observer_(rate_observer),
       vcm_encoded_frame_callback_(encoded_frame_callback),
       internal_source_(internal_source),
       encoder_params_({0, 0, 0, 0}),
@@ -102,10 +100,6 @@ void VCMGenericEncoder::SetEncoderParameters(const EncoderParameters& params) {
   if (rates_have_changed) {
     uint32_t target_bitrate_kbps = (params.target_bitrate + 500) / 1000;
     encoder_->SetRates(target_bitrate_kbps, params.input_frame_rate);
-    if (rate_observer_) {
-      rate_observer_->OnSetRates(params.target_bitrate,
-                                 params.input_frame_rate);
-    }
   }
 }