GitLab

Remove unused strings.

Most of these are from the old Chrome app.

Change-Id: I7e2b7f1a87917239e589f90d0a7d39c3e8215593
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079390Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745334}