Bug 1638276 [wpt PR 23629] - sensors: Call GenericSensorTest.reset() in a cleanup...

Bug 1638276 [wpt PR 23629] - sensors: Call GenericSensorTest.reset() in a cleanup function., a=testonly

Automatic update from web-platform-tests
sensors: Call GenericSensorTest.reset() in a cleanup function.

This addresses some of the flakiness in the sensors tests, in addition to
helping make it easier to find other sources of flakiness.

Instead of calling GenericSensorTest.reset() in a `finally` clause, use
t.add_cleanup() instead. The latter's behavior is more deterministic (see
https://github.com/web-platform-tests/wpt/pull/17924), and fixes an issue
where an EventWatcher would fail an assertion when receiving an unexpected
event, and GenericSensorTest.reset() would either not be called or called
after other tests had already started running.

Bug: 731018
Change-Id: Ifbb95b8067b153b70ecb3e6509f476164afd022e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2203378
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769442}

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wpt-commits: e909362eb429426f97d3c8731855075de9def0b2
wpt-pr: 23629