Ask to re-rebaline some background tests on XP.
Ask to re-rebaline some background tests on XP.

It seems #362623 made mis-rebaseline for XP.

TBR=leviw@chromium.org
BUG=66498
NOTRY=true

Review URL: https://codereview.chromium.org/1491853002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362659}

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