GitLab

This Cl enables "Back" and "Forward" icons to follow the color style of the
button.

Bug: 852551
Change-Id: I75cec2058d7e330db5c7b5d226f47cd0f9f54571
Reviewed-on: https://chromium-review.googlesource.com/1171956Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582473}