[Media Router WebUI] Remove unnecessary default property values.

chrome/test/data/webui/media_router/route_details_tests.js

 // Copyright 2015 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.
 
 /** @fileoverview Suite of tests for route-details. */
 cr.define('route_details', function() {
   function registerTests() {
     suite('RouteDetails', function() {
       /**
        * Route Details created before each test.
@@ skipping 90 matching lines @@
             'start-casting-to-route-click', function() { done(); });
         MockInteractions.tap(details.$['start-casting-to-route-button']);
       });
 
       // Tests the initial expected text.
       test('initial text setting', function() {
         // <paper-button> text is styled as upper case.
         checkSpanText(loadTimeData.getString('stopCastingButtonText')
             .toUpperCase(), 'close-route-button');
         checkSpanText(
-            loadTimeData.getString('startCastingButtonText'),
+            loadTimeData.getString('startCastingButtonText').toUpperCase(),
             'start-casting-to-route-button');
         checkSpanText('', 'route-information');
       });
 
-      // Tests when |route| is null or set.
-      test('route is null or set', function() {
-        // |route| is null.
-        assertEquals(null, details.route);
+      // Tests when |route| is undefined or set.
+      test('route is undefined or set', function() {
+        // |route| is initially undefined.
+        assertEquals(undefined, details.route);
         checkDefaultViewIsShown();
 
-        // Set |route| to be non-null.
+        // Set |route|.
         details.route = fakeRouteOne;
         assertEquals(fakeRouteOne, details.route);
         checkSpanText(loadTimeData.getStringF('castingActivityStatus',
             fakeRouteOne.description), 'route-information');
         checkDefaultViewIsShown();
         checkStartCastButtonIsNotShown();
 
         // Set |route| to a different route.
         details.route = fakeRouteTwo;
         assertEquals(fakeRouteTwo, details.route);
@@ skipping 35 matching lines @@
           done();
         });
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });