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We already enforced this for browser tests.

Change-Id: I9481f3949f5ddfd71f54d6627243c4b4266d292c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636458Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665031}