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This changes BrowserTestBase::SetUp to disallow FeatureList overrides
for the remaining duration of the test. Catches incorrect usage of
ScopedFeatureList which can cause data races.

Bug: 846380
Change-Id: Ie76d59e191edc3ac05c96131e83e5aa0b73dfda7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842111
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705389}