Fix the test by expecting on histgram value

TBR=robertogden@chromium.org

Bug: 948301
Change-Id: I7d3ede0743130a452a900211045b10f59fb32c0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578102
Reviewed-by: rajendrant <rajendrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653046}
1 file changed