Version: 53.0.2785.6
OS: Ubuntu 14.04, Windows

Precondition: 
Enable 'Material Design User Manager' flag from 'chrome://flags'

What steps will reproduce the problem?
(1)Launch chrome ->click on avatar icon 
(2)Now click on 'Switch person' option for User Manager window-> Select 'ADD PERSON' -> Now enter Person Name and hit on "Enter" Button and observe (Please refer "Actual_AddPersonByEnterButton" video)

Expected: On hitting Enter Button person should get added
Actual: Instead New Person is not Created  on hitting Enter Button 

Note:
1.Same is Issue is seen while adding supervised Person i.e. on hitting Enter Button no superviused User is created
(Please refer "Actual_SupervisedPersonByEnterButton" Video)
2. Go to "chrome://settings/createProfile" -> Now enter Person Name and hit on "Enter" Button and observe New person is created (Please refer "Expected_AddPersonByEnterButton" video)


This is Non-Regression Issue as 'Material Design User Manager' flag is enabled from 51.0.2674.0  Build

Below is the MANUAL CHANGELOG URL:
https://chromium.googlesource.com/chromium/src/+log/51.0.2673.0..51.0.2674.0?pretty=fuller&n=10000

Suspecting https://codereview.chromium.org/1782583003 from Manual Changelog

@mahmadi : Please feel free to re-assign if its not related to your change
 

Deleted: Actual_AddPersonByEnterButton.ogv 1.2 MB

	Actual_AddPersonByEnterButton.ogv 1.2 MB View Download

Deleted: Actual_SupervisedPersonByEnterButton.ogv 1.4 MB

	Actual_SupervisedPersonByEnterButton.ogv 1.4 MB View Download

Deleted: Expected_AddPersonByEnterButton.ogv 722 KB

	Expected_AddPersonByEnterButton.ogv 722 KB View Download

Deleted: Expected_SupervisedPersonByEnterButton.ogv 1.6 MB

	Expected_SupervisedPersonByEnterButton.ogv 1.6 MB View Download