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The feature is fully launched and we now have allowlists pushed by the
component updater. Remove the flag and clean up the tests.

Change-Id: I86a2da492ae09748306f2c68846090cba05bff02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253020
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Livvie Lin <livvielin@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780095}