GitLab

Instead of defining a function object and then adding functions to it,
wrap everything in a cr.define, which can be removed later once
these tests are fully migrated to use JS modules.

Update all test classes to es6 classes.

Bug: 1026426
Change-Id: I004fb0798b5a855bda2de9c3f996fe346937e1cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088650Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747471}