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After trial, UX decided to change the color of stacked notification
counter.

TEST=manual
BUG=876469

Change-Id: I8492716588048d74b8bdbea611e580fb35701556
Reviewed-on: https://chromium-review.googlesource.com/1184735Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585352}