Hide "Add user" button when enrollment screen is active.

chrome/browser/resources/chromeos/login/header_bar.js

Index: chrome/browser/resources/chromeos/login/header_bar.js
diff --git a/chrome/browser/resources/chromeos/login/header_bar.js b/chrome/browser/resources/chromeos/login/header_bar.js
index 0fc17fb2a93b57fde5fcd82d3e45490eac715625..7c9f4c7e4bafa80d443c62c2c064dfaea0767f44 100644
--- a/chrome/browser/resources/chromeos/login/header_bar.js
+++ b/chrome/browser/resources/chromeos/login/header_bar.js
@@ -309,6 +309,8 @@ cr.define('login', function() {
      */
     updateUI_: function() {
       var gaiaIsActive = (this.signinUIState_ == SIGNIN_UI_STATE.GAIA_SIGNIN);
+      var enrollmentIsActive =
+          (this.signinUIState_ == SIGNIN_UI_STATE.ENROLLMENT);
       var accountPickerIsActive =
           (this.signinUIState_ == SIGNIN_UI_STATE.ACCOUNT_PICKER);
       var supervisedUserCreationDialogIsActive =
@@ -337,6 +339,7 @@ cr.define('login', function() {
       $('add-user-button').hidden =
           (!this.isNewGaiaFlow_ && !accountPickerIsActive) ||
           (this.isNewGaiaFlow_ && gaiaIsActive) ||
+          enrollmentIsActive ||
           isMultiProfilesUI ||
           isLockScreen ||
           supervisedUserCreationDialogIsActiveAndNotIntro;