Replace a few occurrences of hardcoded kGoogleGrey100

Change-Id: I5e40d6af96f6d72ceefabb7af4ad3fac647e5c36
Reviewed-on: https://chromium-review.googlesource.com/c/1379085
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616962}
4 files changed