Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/retaining_path/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/curly_block.dart';
 import 'package:observatory/src/elements/instance_ref.dart';
 import 'package:observatory/src/elements/retaining_path.dart';
 import '../mocks.dart';
 
 main() {
   RetainingPathElement.tag.ensureRegistration();
 
   final cTag = CurlyBlockElement.tag.name;
   final iTag = InstanceRefElement.tag.name;
 
   const isolate = const IsolateRefMock();
   const object = const InstanceRefMock();
   final paths = new RetainingPathRepositoryMock();
   final instances = new InstanceRepositoryMock();
   test('instantiation', () {
     final e = new RetainingPathElement(isolate, object, paths, instances);
     expect(e, isNotNull, reason: 'element correctly created');
     expect(e.isolate, equals(isolate));
     expect(e.object, equals(object));
   });
   test('elements created after attachment', () async {
     const source = const InstanceRefMock(id: 'source-id', name: 'source_name');
-    const path = const RetainingPathMock(elements: const [
-      const RetainingPathItemMock(source: source)
-    ]);
+    const path = const RetainingPathMock(
+        elements: const [const RetainingPathItemMock(source: source)]);
     bool invoked = false;
     final paths = new RetainingPathRepositoryMock(
-      getter: expectAsync((i, id) async {
-        expect(i, equals(isolate));
-        expect(id, equals(object.id));
-        invoked = true;
-        return path;
-      }, count: 1)
-    );
+        getter: expectAsync((i, id) async {
+      expect(i, equals(isolate));
+      expect(id, equals(object.id));
+      invoked = true;
+      return path;
+    }, count: 1));
     final instances = new InstanceRepositoryMock();
     final e = new RetainingPathElement(isolate, object, paths, instances);
     document.body.append(e);
     await e.onRendered.first;
     expect(invoked, isFalse);
     expect(e.children.length, isNonZero, reason: 'has elements');
     expect(e.querySelectorAll(iTag).length, isZero);
     (e.querySelector(cTag) as CurlyBlockElement).toggle();
     await e.onRendered.first;
     expect(invoked, isTrue);
     expect(e.querySelectorAll(iTag).length, equals(1));
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero, reason: 'is empty');
   });
 }