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The tests were flaky because of a race with
WebRtcEventLogManager::task_runner_. The problem is that
SequencedTaskRunner's destructor does not block, allowing us to destroy
a WebRtcEventLogManager objects while its |task_runner_| is still
executing a task that operates on the WebRtcEventLogManager object.

We solve this by making WebRtcEventLogManager work synchronously when
it's used in WebRTCInternals' unit tests (but nowhere else).

Bug: 796047
Change-Id: I76606b9394c1e5c02a3626fd8d3824bea587d1e4
Reviewed-on: https://chromium-review.googlesource.com/850697
Commit-Queue: Elad Alon <eladalon@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527083}