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Now the feature is launched by default, and we do not want to
allow users to control the feature via the flag in m82.

base::Feature is still remained and command line flags work
even after this change.

Enterprise policies are also still remained in the current revision,
but will be removed behind a finch gate in m82. If there is a
serious issue for enterprise users, we may postpone the announced
policy removal.

Bug: 1053866
Change-Id: Id4abe345878a0d25e74202c3e54620616c223607
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065255Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743035}