GitLab

The action button row should take up a fixed size
when it is collapsed. This prevents the buttons moving
around when the title is different lengths.

BUG=960500

Change-Id: I5e96312e6c01289231c9054c6572dbc501aa293c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600352
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657498}