MD Settings: Fix some tests that break when run in Vulcanized mode.

chrome/browser/resources/settings/route.js

Index: chrome/browser/resources/settings/route.js
diff --git a/chrome/browser/resources/settings/route.js b/chrome/browser/resources/settings/route.js
index c5b132cb30f0527340e2b1ceef28dc609f8d2ab0..2a779415dc417941ebe88b694984dc9629abaec3 100644
--- a/chrome/browser/resources/settings/route.js
+++ b/chrome/browser/resources/settings/route.js
@@ -302,6 +302,13 @@ cr.define('settings', function() {
     }
   };
 
+  function resetRouteForTesting() {
+    initializeRouteFromUrlCalled_ = false;
+    lastRouteChangeWasPopstate_ = false;
+    currentRoute_ = Route.BASIC;
+    currentQueryParameters_ = new URLSearchParams();
+  }
+
   /**
    * Helper function to set the current route and notify all observers.
    * @param {!settings.Route} route
@@ -386,6 +393,7 @@ cr.define('settings', function() {
     RouteObserverBehavior: RouteObserverBehavior,
     getRouteForPath: getRouteForPath,
     initializeRouteFromUrl: initializeRouteFromUrl,
+    resetRouteForTesting: resetRouteForTesting,
     getCurrentRoute: getCurrentRoute,
     getQueryParameters: getQueryParameters,
     lastRouteChangeWasPopstate: lastRouteChangeWasPopstate,