GitLab

Also removes class toggling hackery.

R=alancutter@chromium.org
BUG=643651
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2321913003
Cr-Commit-Position: refs/heads/master@{#417480}