GitLab

Remove the deprecated v2 css class. Also remove unused assets.

Bug: 812085
Change-Id: I2eef2dd7f1e6386e626903cc294b09d50df765c3
Reviewed-on: https://chromium-review.googlesource.com/c/1490738Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635910}