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We will eventually remove the flag, but due to dogfood messaging we
will keep it around for a bit longer.

Bug: 1138674
Change-Id: I544fe687f5077e2779e7924e5697c6ce1d9d351f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500022
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821451}