GitLab

Adding comments, fixing @property and @synthesize, and moving
all private methods together.
Related to:
crrev.com/c/1718370/4/ios/chrome/browser/ui/authentication/signin_promo_view_mediator.mm#275

Bug: 988060
Change-Id: Ic4986ea549bb6ade54afb0fe8a86e0fe8edda10d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824463
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Auto-Submit: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701958}