GitLab

1. Hide Cancel button as per mocks
2. Fix Upgrade complete string
3. Surface a (changing) line of output from the upgrade process above
the indeterminate progress bar.
4. Indeterminate progress bar is slower moving to indicate glacial
upgrade pace.

Bug: 1024693
Change-Id: Ifface2a6be35ae64440993b0d58a64cce571e2e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065253Reviewed-by: David Munro <davidmunro@google.com>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743859}