Version: 57.0.2987.129 b551bbe0ceab0a0dc2248cde62f8e4c197bad4db-refs/branch-heads/2987@{#880}
OS: Windows(7,8,8.1,10),Linux (14.04 LTS),Mac OS X(10.11.6, 10.12.1)

What steps will reproduce the problem?
1. Launch chrome, navigate to chrome://md-settings/languages
2. Now expand it and click on 'Add languages' and open devtools
3. Now open emulated view and observe vertical scroll bar on 'Add languages' overlay

Actual: Vertical scroll bar appears going out of 'Add languages' overlay 
Expected: Vertical scroll bar should appear properly

This is a non-regression issue, seen from M-54 series as 'Add languages' overlay with outline appears from build # 54.0.2840.0

Kindly review the attached screen cast and video for reference.
 

Deleted: Actual_screenshot.png 180 KB

	Actual_screenshot.png 180 KB View Download

Deleted: Actual_video.mp4 533 KB

	Actual_video.mp4 533 KB View Download