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

chrome/browser/resources/settings/people_page/fingerprint_list.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.
 
 (function() {
 'use strict';
 
 /**
  * The duration in ms of a background flash when a user touches the fingerprint
  * sensor on this page.
@@ skipping 108 matching lines @@
     this.fingerprints_ = fingerprintInfo.fingerprintsList.slice();
     this.$$('.action-button').disabled = fingerprintInfo.isMaxed;
   },
 
   /**
    * Deletes a fingerprint from |fingerprints_|.
    * @param {!{model: !{index: !number}}} e
    * @private
    */
   onFingerprintDeleteTapped_: function(e) {
-    this.browserProxy_.removeEnrollment(e.model.index).then(function(success) {
+    this.browserProxy_.removeEnrollment(e.model.index).then(success => {
       if (success)
         this.updateFingerprintsList_();
-    }.bind(this));
+    });
   },
 
   /**
    * @param {!{model: !{index: !number, item: !string}}} e
    * @private
    */
   onFingerprintLabelChanged_: function(e) {
     this.browserProxy_.changeEnrollmentLabel(e.model.index, e.model.item)
-        .then(function(success) {
+        .then(success => {
           if (success)
             this.updateFingerprintsList_();
-        }.bind(this));
+        });
   },
 
   /**
    * Opens the setup fingerprint dialog.
    * @private
    */
   openAddFingerprintDialog_: function() {
     this.showSetupFingerprintDialog_ = true;
   },
 
@@ skipping 10 matching lines @@
    * @private
    */
   onScreenLocked_: function(screenIsLocked) {
     if (!screenIsLocked &&
         settings.getCurrentRoute() == settings.routes.FINGERPRINT) {
       this.onSetupFingerprintDialogClose_();
     }
   },
 });
 })();