Microsecond resolution is system dependent anyway, so it wasn't reliable.
This CL verifies millisecond timestamps instead of microsecond in tests.
Bug: webrtc:8111
Change-Id: I14aab9a807f747a88b2b84f51becf54f4097931e
Reviewed-on: https://webrtc-review.googlesource.com/c/105561
Reviewed-by: Elad Alon <eladalon@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25138}