Change bug number of paint/selection/seleciton-within-composited-scroller.html
Change bug number of paint/selection/seleciton-within-composited-scroller.html

It's not bug 536999 causing the test needing manual rebaseline.
Bug 570401 is.

BUG=570401
TBR=noel@chromium.org

Review URL: https://codereview.chromium.org/1545453002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#366407}

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