Updates the bottom border to be 15% black instead of black.

This is a UX issue that came up during https://crbug.com/918788

Bug: 853593
Change-Id: If0efdba2d344ee379fb560c61dc43ea4a14c0510
Reviewed-on: https://chromium-review.googlesource.com/c/1415232
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624515}
1 file changed