GitLab

- Updated icons to match specs

Before: https://screenshot.googleplex.com/G3RvHUiZvvm
After: https://screenshot.googleplex.com/QUKrXgmryLi

Bug: 1053704
Change-Id: Ib56d41ae853b724394801f8db3405f6c995d2bd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259474
Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781666}