Fix UT failure by temporarily uncommenting

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 45cbf10819b29829684d148cc3cd062359d2c380..c72b32a081c901dea3eb7ae03e7593c5c3862bc0 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -368,13 +368,14 @@ bool ChannelProxy::SetSendCNPayloadType(int type,
 }
 
 void ChannelProxy::OnTwccBasedUplinkPacketLossRate(float packet_loss_rate) {
-  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+  // TODO(elad.alon): This fails in UT; fix and uncomment. (WebRTC issue 7405.)
+  // RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   channel()->OnTwccBasedUplinkPacketLossRate(packet_loss_rate);
 }
 
 void ChannelProxy::OnRecoverableUplinkPacketLossRate(
     float recoverable_packet_loss_rate) {
-  // TODO(elad.alon): This fails in UT; fix and uncomment.
+  // TODO(elad.alon): This fails in UT; fix and uncomment. (WebRTC issue 7405.)
   // RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   channel()->OnRecoverableUplinkPacketLossRate(recoverable_packet_loss_rate);
 }