Version: 55.0.2846.0 c5c7ef8980b50bc69d99046118ec7ff767c27fa2-refs/heads/master@{#415833} (32/64-bit)
OS: Windows (7,8,8.1,10),Linux (14.04 LTS)

Pr-condition:Please make sure there is at least one download record.

What steps will reproduce the problem?
(1)Launch chrome and navigate to "chrome://downloads/"
(2)Resize the browser window and Click on "More actions" menu(Kindly refer the video)
(3)Observe the vertical scroll bar of "More actions" options.

Actual:Bottom arrow is not seen for vertical scroll bar of "More actions" options.

Expected:Bottom  arrow should be seen for vertical scroll bar of "More actions" options.

This is a Regression issue broken in M-52,below is the Narrow bisect info:
https://chromium.googlesource.com/chromium/src/+log/f4c655a817faf982cdc822b44d536ab5d4316528..0ae252e8c2280bacd2d75c280dc0440f97277e37?pretty=fuller&n=100

Suspecting:r393327?

Good build:52.0.2734.0
Bad build:52.0.2735.0

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

Note:Above issue is not seen on Mac OS.
     

 

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	Actual result.mp4 1.5 MB View Download

Deleted: Expected result.mp4 1.0 MB

	Expected result.mp4 1.0 MB View Download

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	Actual screenshot.png 40.7 KB View Download