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Enable safety check and settings utils unittests.

Switch safety check to grouped style.

Switch to mediator unittests instead of view controller.

Remove unneeded call to resetCheckStartItemIfNeeded.

Bug: 1078782
Change-Id: I16a1c188182747634f8af108bcb72f01bbc20985
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435646
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811313}