Rationale:
* More explicit (you won't miss that when glancing at the code).
* More consistent (see MAYBE_* in other tests).
* Allow to re-activate tests via CLI (--gtest_also_run_disabled_tests).
* Tests won't wrongly show up as PASSING (bug/webrtc:10819),
since they won't show up at all.
Bug: webrtc:9778
Change-Id: Ic32e18cb8ee2352def95206c2aa66e1dea0cc1e3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/146200
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Yves Gerey <yvesg@google.com>
Cr-Commit-Position: refs/heads/master@{#28617}