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There are two changes based on discussion with iOS Chrome team and the
security team:

1. Loop in iOS Chrome team on WebKit security bugs so they can monitor
   status, in case a workaround was landed in iOS Chrome for that bug.
2. Update the mechanism to notify Apple friends per request from
   ddkilzer@apple.com.

Change-Id: I5141a0af8374ee35b2953587bd647cab431600d7
Reviewed-on: https://chromium-review.googlesource.com/c/1337485Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Andrew Whalley <awhalley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611383}