Chrome Version: 69.0.3464.0 (Official Build)3c26b60e3842fee660bcff5eb35aa0587d795f02-refs/branch-heads/3464@{#1} 32/64-bit.
OS: Windows(7,8,8.1,10).

What steps will reproduce the problem?
1. Launch Chrome, navigate to chrome://extensions page and completely resize the browser from RHS to LHS.
2. Enable the 'Developer mode' toggle button and press "Tab" key 3 times so that focus reached to 'Update' button.
3. Press "Shift + Tab" key from keyboard to bring back to focus on "Pack extensions/Load unpacked" button and observe.

Actual: Upper border of "Pack extensions/Load unpacked" seems to be chopped.
Expected: Upper border of "Pack extensions/Load unpacked" should seen properly.

This is a regression issue, broken in M-68 series, below is manual regression range.

Good build: 68.0.3426.0 (Revision: 557429)
Bad build: 68.0.3427.0 (Revision: 557758)

Unable to provide the bisect using has-bisect-per-revision script, hence providing the bisect using old script:
Narrow bisect:
You are probably looking for a change made after 557720 (known good), but no later than 557724 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/998efe38db19486bb8d4b89c520020ba6ddf96bf..96ccf9f146812d5076c6d1ac4574eb2fade4a882

Suspecting: https://chromium.googlesource.com/chromium/src/+/0884a2c6a68829fdb63261916c9239c3ff3cab87

@aee: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note: 
1. This Issue is not seen on Mac(10.12.6 , 10.13.1 , 10.13.6) and Linux(14.04 LTS)  OS.
2. This issue is also reproducible on Beta build # 68.0.3440.25 and Dev build # 69.0.3452.0

Kindly review the attached screen-cast for reference.

Thank you.
 

Deleted: Buttons_Screenshot.png 13.8 KB

	Buttons_Screenshot.png 13.8 KB View Download

Deleted: Actual behavior.mp4 1.1 MB

	Actual behavior.mp4 1.1 MB View Download

Deleted: Expected behavior.mp4 880 KB

	Expected behavior.mp4 880 KB View Download