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The base::CommandLine was overly broad. The flakiness analysis of
https://chromium-review.googlesource.com/c/chromium/src/+/1539787
reported that DumpAccessibilityTreeTest.AccessibilityObject and
QuicAllowedPolicyIsNotSet.NoQuicRegulations were flaky.

The latter has a 1.8% confidence and is on a non-TSan builder, so it's
probably a false positive. DumpAccessibilityTreeTest.AccessibilityObject
is real and is tracked in crbug/946481. Refine the suppression to just
cover that.

(If other command-line races come up, I think it's preferable to add new
suppressions and file new bugs rather than revive the overbroad
base::CommandLine suppression. The overbroad one has let new bugs
through, like the accessibility test.)

Bug: 946481, 334140
Change-Id: If09cb2fa2629751367e3fd822e3ba5159d529492
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1548138
Commit-Queue: David Benjamin <davidben@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646493}