Version: 67.0.3396.18 (Official Build) Revision 399b73768e46f9219d4868a2ad1ccb517da5347d-refs/branch-heads/3396@{#251}(32/64-bit)
OS: Windows (7,8,8.1,10) and Linux (14.04 LTS)

What steps will reproduce the problem?
1. Launch chrome,navigate to chrome://downloads/ and press 'Ctrl + s' to save chrome://downloads page
2. Now create 4 items in download history and observe vertical scroll bar on chrome://downloads page while creating 4th item

Actual: Unwanted glimpse of vertical scroll bar is seen in chrome://downloads/ page
Expected: Unwanted glimpse of vertical scroll bar should not be seen in chrome://downloads/ page and scroll bar should stay on page

This is regression issue, broken in ‘M 63’ and below is the bisect info :
Good build: 63.0.3226.0  (Revision: 504842).
Bad build: 63.0.3227.0 (Revision: 505231).

You are probably looking for a change made after 505153 (known good), but no later than 505154 (first known bad).

CHANGELOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/91958392e61a7859f888a40a858e99377b1bf1e9..45a1249b61ba15af97cd08c95976b1c87a68b53b

Suspect : https://chromium.googlesource.com/chromium/src/+/45a1249b61ba15af97cd08c95976b1c87a68b53b

From the CL above, assigning the issue to the concern owner 

@dbeam- 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 also reproducible on M-66 Stable & Beta (build # 66.0.3359.117) and M-68 Canary (build # 68.0.3405.0).
2. Above issue is not seen on Mac OS X(10.12.6,10.13.1,10.13.5)

Thanks!
 

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