Fix some chromium style warnings in remote_bitrate_estimator.h

webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc

Index: webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
index 6730cbb611a1a94431d5e9d464a001f44a5a1bff..49d4e3a94af4447523533cdc205b0689e9c7f9d7 100644
--- a/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
+++ b/webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.cc
@@ -69,6 +69,11 @@ RemoteBitrateEstimatorSingleStream::~RemoteBitrateEstimatorSingleStream() {
   }
 }
 
+void RemoteBitrateEstimatorSingleStream::IncomingPacketFeedbackVector(
+    const std::vector<PacketInfo>& packet_feedback_vector) {
+  assert(false);
+}
+
 void RemoteBitrateEstimatorSingleStream::IncomingPacket(
     int64_t arrival_time_ms,
     size_t payload_size,