Chrome Version: 51.0.2704.19 (Official Build) 0add88a3aa2b8ecc95df9dd721dd5b05571e7a5b-refs/branch-heads/2704@{#121} 32/64-bit.
OS: Windows(Win 7-Aero enabled), Linux.

URL: https://chrome.google.com/webstore/detail/human-30/meefjekipolcgabfgaclcpdkbghhmoah/related?utm_source=chrome-ntp-icon

What steps will reproduce the problem?
1. Launch chrome, login to chrome with valid credentials, go to above URL and add it.
2. Launch the 'HUMAN 3.0' app from chrome//apps and click on "</>" (Embed) icon.
3. Drag the 'H' slider to extreme right (scroll bar appears) and then drag it to extreme left and observe.

Traces of scroll bar appears on image section.
Traces of scroll bar should not appear on image section.

This is a regression issue, broken in M-51 series, below is bisect info.

Manual regression range:

Good build: 51.0.2695.0
Bad build: 51.0.2696.0

Narrow bisect:
https://chromium.googlesource.com/chromium/src/+log/8694d7b928ba2b7bfe73fbcb74d052faa5eb309c..4c9fd0d3128c87e1289e9ac1d47fec18d7107077?pretty=fuller&n=100

Suspecting: r384377 ?

@sky: Kindly help to reassign if your changes are not related to this issue.

Note: This issue is not seen on Mac OS.

Kindly review the attached screen-cast for reference.
 

Deleted: Traces_Screenshot.png 361 KB

	Traces_Screenshot.png 361 KB View Download

Deleted: Actual_behavior.mp4 1.9 MB

Actual_behavior.mp4 1.9 MB Download

Deleted: Expected_behavior.mp4 644 KB

Expected_behavior.mp4 644 KB Download