Submit button does not show up on md-settings anymore.

chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * 'pin-keyboard' is a keyboard that can be used to enter PINs or more generally
  * numeric values.
  *
  * Properties:
@@ skipping 21 matching lines @@
   properties: {
     /**
      * Whether or not the keyboard's input element should be numerical
      * or password.
      */
     enablePassword: {
       type: Boolean,
       value: false
     },
 
+    /**
+     * Whether or not the keyboard's submit button should be shown.
+     */
+    enableSubmitButton: {
+      type: Boolean,
+      value: false
+    },
+
     /** The value stored in the keyboard's input element. */
     value: {
       type: String,
       notify: true,
       value: '',
       observer: 'onPinValueChange_'
     }
   },
 
   /**
@@ skipping 100 matching lines @@
     // +password will convert a string to a number or to NaN if that's not
     // possible. Number.isInteger will verify the value is not a NaN and that it
     // does not contain decimals.
     // This heuristic will fail for inputs like '1.0'.
     //
     // Since we still support users entering their passwords through the PIN
     // keyboard, we swap the input box to rtl when we think it is a password
     // (just numbers), if the document direction is rtl.
     var enableRtl = (document.dir == 'rtl') && !Number.isInteger(+password);
     return enableRtl ? 'input-non-pin' : '';
+  },
+
+  /**
+   * Computes if the submit button is visible.
+   * @private

[jdufault, 2016/07/21 23:36:36]

Add @param doc for submitEnabled

[sammiequon, 2016/07/29 18:57:38]

Done.

+   */
+  computeSubmitHiddenClass_: function(submitEnabled) {
+    return submitEnabled ? '' : 'submit-button-hidden';
   }
 });