MD Settings: add a concept of "Canonical routes", which include URLs

chrome/test/data/webui/settings/router_tests.js

Index: chrome/test/data/webui/settings/router_tests.js
diff --git a/chrome/test/data/webui/settings/router_tests.js b/chrome/test/data/webui/settings/router_tests.js
index d6d6e124932af96bcb2a1003c02de6023f1815d0..d9529251c6222a46a20507e5ad6511725667f18f 100644
--- a/chrome/test/data/webui/settings/router_tests.js
+++ b/chrome/test/data/webui/settings/router_tests.js
@@ -5,9 +5,10 @@
 suite('routing', function() {
   test('no duplicate routes', function() {
     var urls = new Set();
-    document.createElement('settings-router').routes_.forEach(function(route) {
-      assertFalse(urls.has(route.url), route.url);
-      urls.add(route.url);
-    });
+    document.createElement('settings-router').canonicalRoutes_.forEach(
+        function(route) {
+          assertFalse(urls.has(route.url), route.url);
+          urls.add(route.url);
+        });
   });
 });