Revert of Pass time constant to bwe smoothing filter.

webrtc/audio/audio_send_stream.h

Index: webrtc/audio/audio_send_stream.h
diff --git a/webrtc/audio/audio_send_stream.h b/webrtc/audio/audio_send_stream.h
index 88ecbfc9fbe8920f77db320b491f0a3727f87296..af0513ccf776fd5513f7b10ca17bb0960d1d2ec4 100644
--- a/webrtc/audio/audio_send_stream.h
+++ b/webrtc/audio/audio_send_stream.h
@@ -54,8 +54,7 @@
   // Implements BitrateAllocatorObserver.
   uint32_t OnBitrateUpdated(uint32_t bitrate_bps,
                             uint8_t fraction_loss,
-                            int64_t rtt,
-                            int64_t probing_interval_ms) override;
+                            int64_t rtt) override;
 
   const webrtc::AudioSendStream::Config& config() const;
   void SetTransportOverhead(int transport_overhead_per_packet);