Version: 52.0.2722.0
OS: Ubuntu 12.04,14.04,Windows

What steps will reproduce the problem?
(1)Launch chrome -> go to Chrome://md-settings page
(2)Now click on Avatar icon under "People" -> Now remove the profile name and try to click on back navigation arrow(Please refer video)

Expected: User should not be able to click on back navigation arrow until Profile name is entered
Actual: Instead able to click on back navigation arrow even no name is entered 

This is Non-Regression Issue seen from 51.0.2701.0 and before builds we can see crash on clicking back navigation arrow

Note: In chrome://settings/manageProfile page remove the profile Name and now observe disabled save button (Please refer "Expected_ProfileNameInSeetings" video)

Below is the MANUAL CHANGELOG URL:
https://chromium.googlesource.com/chromium/src/+log/51.0.2700.0..51.0.2701.0?pretty=fuller&n=10000

Suspecting https://codereview.chromium.org/1857203003 from Manual Changelog 

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

 

Deleted: Actual_ProfileName.ogv 1006 KB

Actual_ProfileName.ogv 1006 KB Download

Deleted: Expected_ProfileNameInSettings.ogv 1.2 MB

Expected_ProfileNameInSettings.ogv 1.2 MB Download