Issue 766395  has been merged into this issue.

The first patchset at https://chromium-review.googlesource.com/c/chromium/src/+/944258 generates the attached dialog.  Please take a look and let me know if it's sufficiently harmonious.

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Updated with --enable-features=SecondaryUiMd on

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- remove the close x button
- add a CANCEL button to the left of the default SIGN OUT button
- What's determining the width of this dialog? 448px would be preferred
- remove the line break after email address so that "All users..." runs on the same baseline. 

bettes@ - Before I add the CANCEL button... it has the same effect as the SIGN OUT button.  This dialog is not giving the user a choice... they must sign out.  Should we still add two buttons, even if they do the same thing?

Thanks for the clarification. In that case, we should remove the 'close-x' button. The below requests still apply: 

- remove the close x button
- What's determining the width of this dialog? 448px would be preferred
- remove the line break after email address so that "All users..." runs on the same baseline. 

Here's the latest version, updated as per Comment 11.
bettes@ - How does this look?

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LGTM

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/454c40151b05d71a62829c1b5bdb82140116f1c0

commit 454c40151b05d71a62829c1b5bdb82140116f1c0
Author: glevin <glevin@chromium.org>
Date: Mon May 14 14:46:17 2018

Harmonize SessionAbortedDialog

As per crbug.com/788026 Comments 1,11:
- Change title text
- Consolidate text into one paragraph
- Remove excess whitespace near bottom
- Width = 448px
- Remove X (Close) button from upper right

Bug: 788026
Test: Set whatever policy is needed to disallow multi-signin from an
account, try signing in from that account, observe Harmonious dialog.

Change-Id: I1b5f2d2bf3ae092a28aa8ee48069cfead7c1559d
Reviewed-on: https://chromium-review.googlesource.com/944258
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Greg Levin <glevin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558302}
[modify] https://crrev.com/454c40151b05d71a62829c1b5bdb82140116f1c0/ash/ash_strings.grd
[modify] https://crrev.com/454c40151b05d71a62829c1b5bdb82140116f1c0/ash/session/session_aborted_dialog.cc
[modify] https://crrev.com/454c40151b05d71a62829c1b5bdb82140116f1c0/ash/session/session_aborted_dialog.h

Glevin@, apologies for not catching this before, but is it possible to update the body text string to: 

"Your organization doesn't allow multiple sign-ins. To change accounts, sign out."

Since this is hitting 69, I assume we have enough time for the change and localization? 

Implementation deck with comments:
https://docs.google.com/presentation/d/19yQuvKqmWPxe8TloAQ_5C12FV6v9eQ3qIFDXXuF10G8/edit#slide=id.g3b31c5d673_0_19

The version in the deck is going out in M-68 (it's too late for a string change there).  I can get your latest version in M-69.

+JonAnn