Posting before/after screenshots.

Deleted: vertical_separator.png 1.3 KB

	vertical_separator.png 1.3 KB View Download

Deleted: vertical_separator_after.png 1010 bytes

	vertical_separator_after.png 1010 bytes View Download

Candidate CL at https://chromium-review.googlesource.com/c/chromium/src/+/1054552

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d30fa167b5e4019d8b61b3a82591281f6e8e0bf2

commit d30fa167b5e4019d8b61b3a82591281f6e8e0bf2
Author: dpapad <dpapad@chromium.org>
Date: Sat May 12 00:51:21 2018

WebUI MD Refresh: Adjust separator height/margin and button height.

 - Changing button and separator height to 32px.
 - Changing separator margin to 16px.
 - Removing obsolete logic to use a negative margin for non primary buttons.
   It is obsolete since both types of buttons now have a border and they can
   use the same amount of margin.

Bug:  841858 , 832173 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1b3bf0d5a7f6b4e81bc5e25a16b422a54487214b
Reviewed-on: https://chromium-review.googlesource.com/1054552
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558075}
[modify] https://crrev.com/d30fa167b5e4019d8b61b3a82591281f6e8e0bf2/chrome/browser/resources/settings/appearance_page/appearance_page.html
[modify] https://crrev.com/d30fa167b5e4019d8b61b3a82591281f6e8e0bf2/chrome/browser/resources/settings/controls/controlled_button.html
[modify] https://crrev.com/d30fa167b5e4019d8b61b3a82591281f6e8e0bf2/chrome/browser/resources/settings/settings_shared_css.html
[modify] https://crrev.com/d30fa167b5e4019d8b61b3a82591281f6e8e0bf2/ui/webui/resources/cr_elements/paper_button_style_css.html

Verified the fix on Mac 10.12.6, Windows-10 and Ubuntu 14.04 using Chrome version #68.0.3430.0 as per the comment #0 and #2.
Attaching screen shot for reference.
Observed that the height of vertical separator and sign in button are same.
Hence, the fix is working as expected. 
Adding the verified labels.
Note: Able to reproduce the issue on chrome version with out fix.

Thanks...!!