MD Settings: Lazy load the contents of the "advanced" settings.

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

Index: chrome/test/data/webui/settings/route_tests.js
diff --git a/chrome/test/data/webui/settings/route_tests.js b/chrome/test/data/webui/settings/route_tests.js
index 32e13d1f571686e0326f338ab0ab516ca0c48a44..7344683e06fed0b3300a06541bdc34194197abc7 100644
--- a/chrome/test/data/webui/settings/route_tests.js
+++ b/chrome/test/data/webui/settings/route_tests.js
@@ -19,6 +19,10 @@ suite('route', function() {
     return promise;
   }
 
+  teardown(function() {
+    PolymerTest.clearBody();
+  });
+
   /**
    * Tests a specific navigation situation.
    * @param {!settings.Route} previousRoute
@@ -184,4 +188,15 @@ suite('route', function() {
           settings.getRouteForPath('/keyboard-overlay/'));
     }
   });
+
+  test('isNavigableDialog', function() {
+    assertTrue(settings.Route.CLEAR_BROWSER_DATA.isNavigableDialog);
+    assertTrue(settings.Route.IMPORT_DATA.isNavigableDialog);
+    assertTrue(settings.Route.RESET_DIALOG.isNavigableDialog);
+    assertTrue(settings.Route.SIGN_OUT.isNavigableDialog);
+    assertTrue(settings.Route.TRIGGERED_RESET_DIALOG.isNavigableDialog);
+
+    assertFalse(settings.Route.PRIVACY.isNavigableDialog);
+    assertFalse(settings.Route.DEFAULT_BROWSER.isNavigableDialog);
+  });
 });