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Technically this variable was not uninitialized, as the caller sets it
to 0 beforehand.  But this is fragile and unclear.

Bug: none
Change-Id: I85b56897e9dd767835efa14fd8389ce3005f8e89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586185Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836228}