Settings: Fix Site Details subpage routing

chrome/test/data/webui/settings/route_tests.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.
 
 suite('route', function() {
   test('tree structure', function() {
     // Set up root page routes.
     var BASIC = new settings.Route('/');
+    assertEquals(0, BASIC.depth);
+
     var ADVANCED = new settings.Route('/advanced');
     assertFalse(ADVANCED.isSubpage());
+    assertEquals(0, ADVANCED.depth);
 
     // Test a section route.
-    var PRIVACY = ADVANCED.createChild('/privacy');
-    PRIVACY.section = 'privacy';
+    var PRIVACY = ADVANCED.createSection('/privacy', 'privacy');
     assertEquals(ADVANCED, PRIVACY.parent);
+    assertEquals(1, PRIVACY.depth);
     assertFalse(PRIVACY.isSubpage());
     assertFalse(BASIC.contains(PRIVACY));
     assertTrue(ADVANCED.contains(PRIVACY));
     assertTrue(PRIVACY.contains(PRIVACY));
     assertFalse(PRIVACY.contains(ADVANCED));
 
     // Test a subpage route.
     var SITE_SETTINGS = PRIVACY.createChild('/siteSettings');
     assertEquals('/siteSettings', SITE_SETTINGS.path);
     assertEquals(PRIVACY, SITE_SETTINGS.parent);
+    assertEquals(2, SITE_SETTINGS.depth);
     assertFalse(!!SITE_SETTINGS.dialog);
     assertTrue(SITE_SETTINGS.isSubpage());
     assertEquals('privacy', SITE_SETTINGS.section);
     assertFalse(BASIC.contains(SITE_SETTINGS));
     assertTrue(ADVANCED.contains(SITE_SETTINGS));
     assertTrue(PRIVACY.contains(SITE_SETTINGS));
 
     // Test a sub-subpage route.
     var SITE_SETTINGS_ALL = SITE_SETTINGS.createChild('all');
     assertEquals('/siteSettings/all', SITE_SETTINGS_ALL.path);
     assertEquals(SITE_SETTINGS, SITE_SETTINGS_ALL.parent);
+    assertEquals(3, SITE_SETTINGS_ALL.depth);
     assertTrue(SITE_SETTINGS_ALL.isSubpage());
   });
 
   test('no duplicate routes', function() {
     var paths = new Set();
     Object.values(settings.Route).forEach(function(route) {
       assertFalse(paths.has(route.path), route.path);
       paths.add(route.path);
     });
   });
 });