GitLab

Add functionality for disabling back button on ErrorScreen.

Bug: 1005151
Change-Id: Ic62ca8d56f529d60c2e45c9d2d8e4fcbfeb420d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807230Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Ivan Šandrk <isandrk@chromium.org>
Commit-Queue: Petr Smirnov <petrsmirnov@google.com>
Cr-Commit-Position: refs/heads/master@{#699933}