Roman, could you maybe explain in a little more detail what this is about?

Closing screen and showing it again should clear all the fields.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f8fbc2f83697f63ebb397b5a4212e1635dc4f33a

commit f8fbc2f83697f63ebb397b5a4212e1635dc4f33a
Author: rsorokin <rsorokin@chromium.org>
Date: Thu Feb 02 12:55:56 2017

Reset username for the Active Directory login

BUG= 677517 
TEST=manual
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2665683002
Cr-Commit-Position: refs/heads/master@{#447750}

[modify] https://crrev.com/f8fbc2f83697f63ebb397b5a4212e1635dc4f33a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js

bulk Verify of older or not-user-facing Chromad bugs