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To meet Accessibility's contrast requirement of 4.5:1 minimum.
Using kGoogleGrey700, contrast should be 5.91

Screenshot view: https://screenshot.googleplex.com/8oODpaXk02Y

Bug: 1042084
Change-Id: I7c9980527fe915cb30a34a83f100073d0db4030b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224424Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774455}