Converted Observatory cpu-profile element

runtime/observatory/tests/observatory_ui/source_link/element_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
+
 import 'dart:html';
 import 'package:unittest/unittest.dart';
 import 'package:observatory/src/elements/source_link.dart';
 import '../mocks.dart';
 
 main() {
   SourceLinkElement.tag.ensureRegistration();
 
   const isolate = const IsolateRefMock(id: 'isolate-id');
   const script_id = 'script-id';
@@ skipping 24 matching lines @@
     expect(e.innerHtml.contains(isolate.id), isTrue,
       reason: 'no message in the component');
     expect(e.innerHtml.contains(file), isTrue,
       reason: 'no message in the component');
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero,
       reason: 'is empty');
   });
 }