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According to the UMA.TruncatedEvents.UserAction.Type histogram, this is one of
the most commonly dropped user actions, so we're not getting good data about
this event regardless.

R=dmazzoni@chromium.org

Bug: none
Change-Id: Ib43171563b6208a5fbb4402bc1ee6d77275ab41d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110398
Auto-Submit: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752063}