What about the padding? Does it need to be modified? Specifically:

Before there was a 16px padding between the horizontal separator and the description text above, and 8px padding between horizontal separator and the buttons below.

Now that there is no separator, should we just have 16px total?

Spec attached

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/907f20ac463508fd34ea8c9c91a6e13321169de7

commit 907f20ac463508fd34ea8c9c91a6e13321169de7
Author: Esmael El-Moslimany <aee@chromium.org>
Date: Sat May 12 02:34:57 2018

MD Extensions: remove separator from extensions card

Bug:  842002 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Id343156de4540c33d1db130c9260e9b3fc861ddc
Reviewed-on: https://chromium-review.googlesource.com/1055818
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558098}
[modify] https://crrev.com/907f20ac463508fd34ea8c9c91a6e13321169de7/chrome/browser/resources/md_extensions/item.html

Verified the fix on Mac 10.13.1, Windows-10 and Ubuntu 14.04 using Chrome version #68.0.3430.0 as per the comment #11.
Attaching screenshot for reference.
Hence, the fix is working as expected. 
1. Adding the verified labels as fix is working as expected.
Note: Able to reproduce the issue on chrome version on 68.0.3425.0 with out fix.

Thanks...!!

TE-Verified-M68
TE-Verified-68.0.3430.0

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