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The only place where this event was fired has been removed.
https://crrev.com/c/1369551/ shows in site_entry.js that
the event was removed, and a search of cs for the event
turns up no results.

Change-Id: Id1b198382cfbd004c7fbd6035e2ec7cbc656e845
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869017Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710121}