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According to designers and internal spec (https://goo.gl/oRp6PA), some
colors are a shade lighter.

Bug: 850571
Test: Visual
Change-Id: I2c593ed0019c9497873f0f8efa42b592e187d89b
Reviewed-on: https://chromium-review.googlesource.com/1099687
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568306}