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It's not used any more, and the calling script was changed
to no longer provide it.

Bug: 913074
Change-Id: I01250b226eddb40fd4d523c75f9132c97629a8be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904232
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713577}