Chrome Version:53.0.2766.0 (Official Build) e40502b71c9bd4f548118550952afd5d6a158bc4-refs/heads/master@{#399363} 32/64 bit.
OS: Windows(7,8,10),Linux (14.04 LTS)

Test URL:https://chrome.google.com/webstore/detail/model-scaler/gcjaflhdpihnmbmfhdomllinepfkikob/related

What steps will reproduce the problem?
(1)Launch chrome and navigate to above url ,add app.
(2)Launch app and click on the menu icon seen on the top of the window.
(3)Observe the drop down menu under "Actual" option.(Refer the video)

Actual:Drop down button is not seen properly i.e unwanted white line is seen under button.

Expected:No unwanted  white line should be seen at the bottom of drop down menu list.

This is a Regression issue broken in M-53,below is the Narrow bisect info:
https://chromium.googlesource.com/chromium/src/+log/974eca1eda78d904c2aab3e5007036b61bd01d14..fe771cfc4e0fa2de3c7e4518d9eeb696fd6a305a?pretty=fuller&n=100

Suspecting:r399293?

Good build:53.0.2764.0
Bad build:53.0.2766.0

Kindly help to re-assign if your change is not the cause for this issue.


 

Deleted: Actual result.mp4 746 KB

	Actual result.mp4 746 KB View Download

Deleted: Expected result.mp4 518 KB

	Expected result.mp4 518 KB View Download