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This launch has been rolled out to all Canary/Dev users for a few days,
and we don't see any stability impact. Since this code only triggers on
a small proportion of downloads from Advanced Protection users (~50,000
users), we don't expect our code paths have actually been executed much
in the wild. We can be reasonably confident we aren't causing problems
for non-APP users, however.

Change-Id: I9a3cf16459d839623ac8417a032dce031cbed798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402134
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808445}