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

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

Index: chrome/browser/resources/settings/people_page/user_list.js
diff --git a/chrome/browser/resources/settings/people_page/user_list.js b/chrome/browser/resources/settings/people_page/user_list.js
index f1cbc795b4830ee62d2becb31aabcd9620347030..f897fc9ba591d8ccab5e03859f14d8d70f5569f2 100644
--- a/chrome/browser/resources/settings/people_page/user_list.js
+++ b/chrome/browser/resources/settings/people_page/user_list.js
@@ -47,23 +47,23 @@ Polymer({
 
   /** @override */
   ready: function() {
-    chrome.settingsPrivate.onPrefsChanged.addListener(function(prefs) {
+    chrome.settingsPrivate.onPrefsChanged.addListener(prefs => {
       prefs.forEach(function(pref) {
         if (pref.key == 'cros.accounts.users') {
-          chrome.usersPrivate.getWhitelistedUsers(function(users) {
+          chrome.usersPrivate.getWhitelistedUsers(users => {
             this.setUsers_(users);
-          }.bind(this));
+          });
         }
       }, this);
-    }.bind(this));
+    });
   },
 
   /** @protected */
   currentRouteChanged: function() {
     if (settings.getCurrentRoute() == settings.routes.ACCOUNTS) {
-      chrome.usersPrivate.getWhitelistedUsers(function(users) {
+      chrome.usersPrivate.getWhitelistedUsers(users => {
         this.setUsers_(users);
-      }.bind(this));
+      });
     }
   },