Remove the unused `receive_timestamp` arg to NetEq::InsertPacket

The implementation just ignores the provided timestamp, and gets the
time from the current clock instead.

Bug: webrtc:11028
Change-Id: I7a1fee36bef862c68d8f15fd19ee53b2bbb25892
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156164
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29434}
diff --git a/modules/audio_coding/acm2/acm_receiver.cc b/modules/audio_coding/acm2/acm_receiver.cc
index da27c0f..1c8d88d 100644
--- a/modules/audio_coding/acm2/acm_receiver.cc
+++ b/modules/audio_coding/acm2/acm_receiver.cc
@@ -114,9 +114,7 @@
     }
   }  // |crit_sect_| is released.
 
-  uint32_t receive_timestamp = NowInTimestamp(format->clockrate_hz);
-  if (neteq_->InsertPacket(rtp_header, incoming_payload, receive_timestamp) <
-      0) {
+  if (neteq_->InsertPacket(rtp_header, incoming_payload) < 0) {
     RTC_LOG(LERROR) << "AcmReceiver::InsertPacket "
                     << static_cast<int>(rtp_header.payloadType)
                     << " Failed to insert packet";