Remove unnecessary conversions.

`receive_timestamp` is already a `Timestamp`.

Bug: None
Change-Id: I334c6d591915115f3a577ac14183fc122517c313
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227080
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Fanny Linderborg <linderborg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34582}
diff --git a/logging/rtc_event_log/rtc_event_log_parser.cc b/logging/rtc_event_log/rtc_event_log_parser.cc
index cb4be8f..2e67d52 100644
--- a/logging/rtc_event_log/rtc_event_log_parser.cc
+++ b/logging/rtc_event_log/rtc_event_log_parser.cc
@@ -2166,8 +2166,7 @@
           if (packet.received()) {
             receive_timestamp += TimeDelta::Micros(packet.delta_us());
             if (sent->reported_recv_time.IsInfinite()) {
-              sent->reported_recv_time =
-                  Timestamp::Millis(receive_timestamp.ms());
+              sent->reported_recv_time = receive_timestamp;
               sent->log_feedback_time = log_feedback_time;
             }
           } else {