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/modules/video_coding/video_packet_buffer_unittest.cc b/modules/video_coding/video_packet_buffer_unittest.cc
index 3ef5624..9d8a3b0 100644
--- a/modules/video_coding/video_packet_buffer_unittest.cc
+++ b/modules/video_coding/video_packet_buffer_unittest.cc
@@ -501,7 +501,7 @@
   uint16_t seq_num = kFirstSeqNum;
 
   // Loop until seq_num wraps around.
-  SeqNumUnwrapper<uint16_t> unwrapper(0);
+  SeqNumUnwrapper<uint16_t> unwrapper;
   while (unwrapper.Unwrap(seq_num) < std::numeric_limits<uint16_t>::max()) {
     Insert(seq_num++, kKeyFrame, kFirst, kNotLast, 0, nullptr, timestamp);
     for (int i = 0; i < 5; ++i) {