The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/62796f0b8459f366de614acefd1cd5979d298799

commit 62796f0b8459f366de614acefd1cd5979d298799
Author: Vasilii Sukhanov <vasilii@chromium.org>
Date: Fri Jul 27 10:21:31 2018

Limit sizes of the password and username label in the password dropdown.

The spec specifies max width for labels in the password dropdown.

Bug:  868020 
Change-Id: I112c0866e7f0f0165b82f72bdc55c21a25c6c09f
Reviewed-on: https://chromium-review.googlesource.com/1151637
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578583}
[modify] https://crrev.com/62796f0b8459f366de614acefd1cd5979d298799/chrome/browser/ui/views/autofill/autofill_popup_view_native_views.cc

I'd like to merge r578583. The UI looks nicer with it for the corner cases.

Your change meets the bar and is auto-approved for M69. Please go ahead and merge the CL to branch 3497 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), kariahda@(iOS), cindyb@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8a0f54665e92b6a97c4407eca12c22d375051b6d

commit 8a0f54665e92b6a97c4407eca12c22d375051b6d
Author: Vasilii Sukhanov <vasilii@chromium.org>
Date: Tue Jul 31 12:43:20 2018

Limit sizes of the password and username label in the password dropdown.

The spec specifies max width for labels in the password dropdown.

TBR=vasilii@chromium.org

(cherry picked from commit 62796f0b8459f366de614acefd1cd5979d298799)

Bug:  868020 
Change-Id: I112c0866e7f0f0165b82f72bdc55c21a25c6c09f
Reviewed-on: https://chromium-review.googlesource.com/1151637
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#578583}
Reviewed-on: https://chromium-review.googlesource.com/1156545
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/branch-heads/3497@{#266}
Cr-Branched-From: 271eaf50594eb818c9295dc78d364aea18c82ea8-refs/heads/master@{#576753}
[modify] https://crrev.com/8a0f54665e92b6a97c4407eca12c22d375051b6d/chrome/browser/ui/views/autofill/autofill_popup_view_native_views.cc

vasilii@ - Could you please provide a sample test file/url and manual repro steps to verify the issue from TE-end.

Thanks...!!

https://rsolomakhin.github.io/autofill/

"Sign in" there with a long username/password and save the credential. Go back to the site and click on the username or password field.