GitLab

Add UI for informing when an activation code is invalid in the
activation code page.

Screenshot:
https://screenshot.googleplex.com/3gLCppUSwZbqovc.png

Bug: 1093185
Change-Id: Ieb9959cdbd0dd754454eaa69d5c5f4ac5453c8fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2555917
Commit-Queue: Gordon Seto <gordonseto@google.com>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830714}