MD Settings: Convert all usages of .bind(this) to use ES6 arrow function.

chrome/browser/resources/settings/people_page/setup_fingerprint_dialog.js

 // Copyright 2017 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.
 
 cr.exportPath('settings');
 
 /**
  * The steps in the fingerprint setup flow.
  * @enum {number}
  */
@@ skipping 203 matching lines @@
    * Set the problem message based on the result from the fingerprint scanner.
    * @param {!settings.FingerprintResultType} scanResult The result the
    *     fingerprint scanner gives.
    * @private
    */
   setProblem_: function(scanResult) {
     this.clearSensorMessageTimeout_();
     switch (scanResult) {
       case settings.FingerprintResultType.SUCCESS:
         this.problemMessage_ = '';
-        this.tapSensorMessageTimeoutId_ = setTimeout(function() {
+        this.tapSensorMessageTimeoutId_ = setTimeout(() => {
           this.problemMessage_ = this.i18n('configureFingerprintLiftFinger');
-        }.bind(this), SHOW_TAP_SENSOR_MESSAGE_DELAY_MS);
+        }, SHOW_TAP_SENSOR_MESSAGE_DELAY_MS);
         break;
       case settings.FingerprintResultType.PARTIAL:
         this.problemMessage_ = this.i18n('configureFingerprintPartialData');
         break;
       case settings.FingerprintResultType.INSUFFICIENT:
         this.problemMessage_ =
             this.i18n('configureFingerprintInsufficientData');
         break;
       case settings.FingerprintResultType.SENSOR_DIRTY:
         this.problemMessage_ = this.i18n('configureFingerprintSensorDirty');
@@ skipping 53 matching lines @@
    */
   onAddAnotherFingerprint_: function() {
     this.fire('add-fingerprint');
     this.reset_();
     this.$.arc.drawBackgroundCircle();
     this.$.arc.drawShadow(10, 0, 0);
     this.browserProxy_.startEnroll();
   },
 });
 })();