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We will be using primary colors for inactive search box placeholder text
and secondary colors for active search box placeholder text.

Bug: 1156231
Change-Id: I1285bb3f6630e103bfd1cf192e9065d248614b07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581023Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835294}