GitLab

These image colors are either used as placeholder background colors or
error colors. We can safely replace them with kPlaceholderColor.

BUG=1059867

Change-Id: Ie4485eb333dae5d52a238eeeb8e9cf6c6391553c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134625Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756110}