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

chrome/browser/resources/settings/route.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.
 
 /**
  * Specifies all possible routes in settings.
  *
  * @typedef {{
  *   ABOUT: (undefined|!settings.Route),
  *   ABOUT_ABOUT: (undefined|!settings.Route),
@@ skipping 411 matching lines @@
      * Helper function to set the current route and notify all observers.
      * @param {!settings.Route} route
      * @param {!URLSearchParams} queryParameters
      * @param {boolean} isPopstate
      */
     setCurrentRoute(route, queryParameters, isPopstate) {
       var oldRoute = this.currentRoute;
       this.currentRoute = route;
       this.currentQueryParameters_ = queryParameters;
       this.wasLastRouteChangePopstate_ = isPopstate;
-      routeObservers.forEach(function(observer) {
+      routeObservers.forEach(observer => {
         observer.currentRouteChanged(this.currentRoute, oldRoute);
-      }.bind(this));
+      });
     }
 
     /** @return {!settings.Route} */
     getCurrentRoute() {
       return this.currentRoute;
     }
 
     /** @return {!URLSearchParams} */
     getQueryParameters() {
       return new URLSearchParams(
           this.currentQueryParameters_);  // Defensive copy.
     }
 
     /** @return {boolean} */
     lastRouteChangeWasPopstate() {
       return this.wasLastRouteChangePopstate_;
     }
 
     /**
      * @param {string} path
      * @return {?settings.Route} The matching canonical route, or null if none
      *     matches.
      */
     getRouteForPath(path) {
       // Allow trailing slash in paths.
       var canonicalPath = path.replace(CANONICAL_PATH_REGEX, '$1$2');
 
       // TODO(tommycli): Use Object.values once Closure compilation supports it.
-      var matchingKey = Object.keys(this.routes_).find(function(key) {
-        return this.routes_[key].path == canonicalPath;
-      }.bind(this));
+      var matchingKey =
+          Object.keys(this.routes_)
+              .find(key => this.routes_[key].path == canonicalPath);
 
       return !!matchingKey ? this.routes_[matchingKey] : null;
     }
 
     /**
      * Navigates to a canonical route and pushes a new history entry.
      * @param {!settings.Route} route
      * @param {URLSearchParams=} opt_dynamicParameters Navigations to the same
      *     URL parameters in a different order will still push to history.
      * @param {boolean=} opt_removeSearch Whether to strip the 'search' URL
@@ skipping 144 matching lines @@
     getRouteForPath: getRouteForPath,
     initializeRouteFromUrl: initializeRouteFromUrl,
     resetRouteForTesting: resetRouteForTesting,
     getCurrentRoute: getCurrentRoute,
     getQueryParameters: getQueryParameters,
     lastRouteChangeWasPopstate: lastRouteChangeWasPopstate,
     navigateTo: navigateTo,
     navigateToPreviousRoute: navigateToPreviousRoute,
   };
 });