GitLab

The default color used by bookmark menu expanding arrows is black. On
Windows, the color is retrieved from system text color. However, none of
those responds well to different themes. Change to get the color from
native theme.

BUG=1059867

Change-Id: Id7c998a4d82bf6812ac9461139fbf72065c9bf03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146174
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758530}