More fixes.

samples/swarm/swarm_ui_lib/view/view.dart

 // Copyright (c) 2012, 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.
 
 library view;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:math' as Math;
 
@@ skipping 311 matching lines @@
 
   void doLayout() {
     _measureLayout().then((changed) {
       if (changed) {
         _applyLayoutToChildren();
       }
     });
   }
 
   Future<bool> _measureLayout() {
-    final changed = new Completer<bool>();
+    // TODO(10459): code should not use Completer.sync.
+    final changed = new Completer<bool>.sync();
     _measureLayoutHelper(changed);
 
     var changedComplete = false;
     changed.future.then((_) {
       changedComplete = true;
     });
 
     window.setImmediate(() {
       if (!changedComplete) {
         changed.complete(false);
       }
     });
     return changed.future;
   }
 
   void _measureLayoutHelper(Completer<bool> changed) {
     windowResized();
 
     // TODO(jmesserly): this logic is more complex than it needs to be because
     // we're taking pains to not initialize _layout if it's not needed. Is that
     // a good tradeoff?
     if (ViewLayout.hasCustomLayout(this)) {
-      Completer sizeCompleter = new Completer<Size>();
+      // TODO(10459): code should not use Completer.sync.
+      Completer sizeCompleter = new Completer<Size>.sync();
       window.setImmediate(() {
         sizeCompleter.complete(
             new Size(_node.client.width, _node.client.height));
       });
       layout.measureLayout(sizeCompleter.future, changed);
     } else {
       for (final child in childViews) {
         child._measureLayoutHelper(changed);
       }
     }
   }
 
   void _applyLayoutToChildren() {
     for (final child in childViews) {
       child._applyLayout();
     }
   }
 
   void _applyLayout() {
     if (_layout != null) {
       _layout.applyLayout();
     }
     _applyLayoutToChildren();
   }
 }