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This was the only consumer of it, so this scopes the usage more
narrowly.

Bug: none
Change-Id: I200653b423e6538ee8d0b42a28ea7195853a6c49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283401
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786142}