Revert of Pass time constant to bwe smoothing filter.

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index 04fa93f6ab74403049301fc1726f6d962c3ce12f..1d67f689a7ac41160130715f79e08ae237a12e59 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -148,9 +148,9 @@
   return channel()->SendTelephoneEventOutband(event, duration_ms) == 0;
 }
 
-void ChannelProxy::SetBitrate(int bitrate_bps, int64_t probing_interval_ms) {
+void ChannelProxy::SetBitrate(int bitrate_bps) {
   // May be called on different threads and needs to be handled by the channel.
-  channel()->SetBitRate(bitrate_bps, probing_interval_ms);
+  channel()->SetBitRate(bitrate_bps);
 }
 
 void ChannelProxy::SetSink(std::unique_ptr<AudioSinkInterface> sink) {