This converts all time parameters to signed, finishing a cleanup that
was started in 2018 in b4256bf0. This changes the type of:
- timestamps
- PTS specifically
- timestamp offsets
- timescales
- durations
This excludes:
- MP4 box definitions
- DTS specifically
This is meant to address signed/unsigned conversion issues on arm64
that caused some test cases to fail.
Change-Id: Ic752a20cbc6e31fea6bc0894d1771833171e7cbe
Also rename mpd/base/bandwidth_estimator_test.cc to
bandwidth_estimator_unittest.cc for consistency.
And remove mpd/base/simple_vod_mpd_notifier.* as they are not used
anywhere.
Change-Id: Iaeb096aef9259837a4eb356c18d5ca15f08d2376