This is a regression since https://chromium-review.googlesource.com/c/chromium/src/+/1050799 landed.

will look at this today. Thanks for report.

 Issue 841719  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5052c19bd41059cf0cfc206f8af218a164a9df01

commit 5052c19bd41059cf0cfc206f8af218a164a9df01
Author: Evan Stade <estade@chromium.org>
Date: Mon May 21 22:16:11 2018

Chrome OS - Don't show window title in container windows.

This restores the behavior that the window title won't be shown
in the window frame for container windows (ARC++/Crostini). The
exception is when a debug title ("extra title") has been set, in
which case the debug string is shown.

Overview mode will use the normal title, unless a debug/"extra" title
is set, in which case it uses that.

Bug:  842476 
Change-Id: Id0df3466b66e769363f313772bf63ff9f26e7b80
Reviewed-on: https://chromium-review.googlesource.com/1058560
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560373}
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/ash/frame/custom_frame_view_ash.cc
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/ash/frame/custom_frame_view_ash.h
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/components/exo/client_controlled_shell_surface.cc
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/components/exo/client_controlled_shell_surface_unittest.cc
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/components/exo/shell_surface_base.cc
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/components/exo/shell_surface_base.h
[modify] https://crrev.com/5052c19bd41059cf0cfc206f8af218a164a9df01/components/exo/shell_surface_unittest.cc

fixed for crostini. For ARC++ apps in debug mode, I'm re-opening 841719