SeqNumUnwrapper::Unwrap now returns int64_t instead of uint64_t.

Bug: webrtc:10263
Change-Id: Idaeae6be01bd4eba0691226c958d70e114161ffd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127295
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Johannes Kron <kron@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27129}
diff --git a/rtc_tools/event_log_visualizer/analyzer.cc b/rtc_tools/event_log_visualizer/analyzer.cc
index 7f07329..2023336 100644
--- a/rtc_tools/event_log_visualizer/analyzer.cc
+++ b/rtc_tools/event_log_visualizer/analyzer.cc
@@ -140,10 +140,10 @@
     int64_t end_time_us) {
   RTC_CHECK(packets.size() >= 2);
   SeqNumUnwrapper<uint32_t> unwrapper;
-  uint64_t first_rtp_timestamp =
+  int64_t first_rtp_timestamp =
       unwrapper.Unwrap(packets[0].rtp.header.timestamp);
   int64_t first_log_timestamp = packets[0].log_time_us();
-  uint64_t last_rtp_timestamp = first_rtp_timestamp;
+  int64_t last_rtp_timestamp = first_rtp_timestamp;
   int64_t last_log_timestamp = first_log_timestamp;
   for (size_t i = 1; i < packets.size(); i++) {
     if (packets[i].log_time_us() > end_time_us)