GitLab

This change:
1) Removes the can_close parameter to chrome::ShowWarningMessageBox()
2) Removes the code supporting that parameter, making close always possible
   on message boxes
3) Renames SimpleMessageBoxViews to MessageBoxDialog, to indicate that it
   is a dialog rather than a View

Bug: 1011446
Change-Id: Ia4e0ba79ad170bc7837d48eb380ff752236c05ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028667Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736889}