GitLab

Removing 'non-white-bg' class as search suggestions was the only user
of it and they are not using it anymore.

Bug: None
Change-Id: Icb118c92f4117b6f6a7da5d6c97acdcf994c380d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811929
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699406}