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This is to enable developers to turn it off for testing what future
deprecation will look like.

Bug: 582750,1055010
Change-Id: I7ea0570ec6cda99ec8027219ba5f272d875b679c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124237
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755426}