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This commit fix the text highlighted problem both on cancel/done
button and the custom background dialog title.

Bug: 869086
Change-Id: I6e67f241409ed5498f703ec48966da0105ee5925
Reviewed-on: https://chromium-review.googlesource.com/1171792Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582725}