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It's been launched successfully for some time now. Removing this flag
from the codebase enables a number of cleanups.

Bug: 945035
Change-Id: Ie614bc7f045558662c1129446255e882a29bcada
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536555
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645066}