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This will prevent notification counter icon shown in white while
in the OOBE screen, when the background of the icons are also
bright color.

Test: manual test
Bug: 874021
Change-Id: I91cbbd1111b33d1a030b1d5aae2bdd884a1d487a
Reviewed-on: https://chromium-review.googlesource.com/1175517Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583179}