GitLab

- Delete ticket items and other unused files in data/
- Complete TODOs in handler
- Remove unused strings

Bug: 908705
Change-Id: Ie02a00ad6b8ada56b3d327d75e2ad841e534cb9f
Reviewed-on: https://chromium-review.googlesource.com/c/1357527
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613267}