GitLab

Default colour was white most likely by mistake which forced white as
the default background and foreground colour for captions.

Bug: 1000609
Change-Id: I87614e191ec3b3a1424f371d208691a7b6effa32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786250Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693951}