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This CL replaces calls to base::TaskEnvironment::RunUntilIdle() with a
base::RunLoop that is Quit() when the tested function's base::Callback
is executed. A few minor cleanups are included.

Change-Id: I94488c922df13fe67bdd246c80c7f15064a1bda8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644144
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846287}