Converted Observatory nav-bar element

runtime/observatory/tests/observatory_ui/nav/bar/element_test.dart

Index: runtime/observatory/tests/observatory_ui/nav/bar/element_test.dart
diff --git a/runtime/observatory/tests/observatory_ui/view_footer/element_test.dart b/runtime/observatory/tests/observatory_ui/nav/bar/element_test.dart
similarity index 52%
copy from runtime/observatory/tests/observatory_ui/view_footer/element_test.dart
copy to runtime/observatory/tests/observatory_ui/nav/bar/element_test.dart
index f3ab727b2b5642337b1697f8ba1a7db09c61cf70..fe547857a42a4f11ec601d27ce1dc0d96b941e11 100644
--- a/runtime/observatory/tests/observatory_ui/view_footer/element_test.dart
+++ b/runtime/observatory/tests/observatory_ui/nav/bar/element_test.dart
@@ -3,22 +3,24 @@
 // BSD-style license that can be found in the LICENSE file.
 import 'dart:html';
 import 'package:unittest/unittest.dart';
-import 'package:observatory/src/elements/view_footer.dart';
+import 'package:observatory/src/elements/nav/bar.dart';
 
 main() {
-  ViewFooterElement.tag.ensureRegistration();
+  NavBarElement.tag.ensureRegistration();
 
   test('instantiation', () {
-    final ViewFooterElement e = new ViewFooterElement();
+    final NavBarElement e = new NavBarElement();
     expect(e, isNotNull, reason: 'element correctly created');
   });
   test('elements created', () async {
-    final ViewFooterElement e = new ViewFooterElement();
+    final NavBarElement e = new NavBarElement();
     document.body.append(e);
     await e.onRendered.first;
-    expect(e.children.length, isNonZero, reason: 'has elements');
+    expect(e.shadowRoot.children.length, isNonZero, reason: 'has elements');
+    expect(e.shadowRoot.querySelector('content'), isNotNull,
+                                               reason: 'has content elements');
     e.remove();
     await e.onRendered.first;
-    expect(e.children.length, isZero, reason: 'is empty');
+    expect(e.shadowRoot.children.length, isZero, reason: 'is empty');
   });
 }