MD Settings: Allow trailing slashes in otherwise valid URLs.

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.
 
 cr.define('settings', function() {
   /**
    * Class for navigable routes. May only be instantiated within this file.
    * @constructor
    * @param {string} path
    * @private
@@ skipping 220 matching lines @@
      * @param {!settings.Route|undefined} opt_newRoute
      * @param {!settings.Route|undefined} opt_oldRoute
      * @abstract
      */
     currentRouteChanged: function(opt_newRoute, opt_oldRoute) {
       assertNotReached();
     },
   };
 
   /**
-   * Returns the matching canonical route, or null if none matches.
+   * Regular expression that captures the leading slash, the content and the
+   * trailing slash in three different groups.
+   * @const {!RegExp}
+   */
+  var CANONICAL_PATH_REGEX = /(^\/)([\/-\w]+)(\/$)/;
+
+  /**
    * @param {string} path
-   * @return {?settings.Route}
+   * @return {?settings.Route} The matching canonical route, or null if none
+   *     matches.
    */
   var getRouteForPath = function(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(Route).find(function(key) {
-      return Route[key].path == path;
+      return Route[key].path == canonicalPath;
     });
 
-    return Route[matchingKey] || null;
+    return !!matchingKey ? Route[matchingKey] : null;
   };
 
   /**
    * The current active route. This updated is only by settings.navigateTo or
    * settings.initializeRouteFromUrl.
    * @private {!settings.Route}
    */
   var currentRoute_ = Route.BASIC;
 
   /**
@@ skipping 109 matching lines @@
     RouteObserverBehavior: RouteObserverBehavior,
     getRouteForPath: getRouteForPath,
     initializeRouteFromUrl: initializeRouteFromUrl,
     getCurrentRoute: getCurrentRoute,
     getQueryParameters: getQueryParameters,
     lastRouteChangeWasPopstate: lastRouteChangeWasPopstate,
     navigateTo: navigateTo,
     navigateToPreviousRoute: navigateToPreviousRoute,
   };
 });