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Actually hooking this up to a blocklist etc will be done in future CLs.
See https://storage.cloud.google.com/chromium-translation-screenshots/8f6df1b3e036b7d1ff3f02ffb177ce99865ad7cb
for what this dialog looks like.

Bug: 968851
Change-Id: I20930d63e1e799da92dd9784678bb12f6b8e2f74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680950
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676132}