Reapply remove setInterval.

samples/calculator/calculator.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.
 
 import 'dart:html';
 import 'dart:math' as Math;
 import 'calcui.dart';
+import 'dart:async';
 
 Set numberKeyPresses;
 Set operatorKeyPresses;
 Set equalKeyPresses;
 Set clearKeyPresses;
 Set dotKeyPresses;
 Set backspacePresses;
 List eventSubscriptions = [];
 
 void setupEvents() {
@@ skipping 299 matching lines @@
   // Only Change classes with 1 hyphen that's the main class for an element
   // to handle hover and active.
   String theClass;
   for (final String cls in key.classes) {
     if (cls.split('-').length == 2) {
       theClass = cls;
     }
   }
   key.classes.add('${theClass}${postfix}');
   final String nextPostfix = (postfix == '-error') ? '-error' : '-press';
-  window.setTimeout(() => resetKey(key, '${theClass}${postfix}',
-    '${theClass}${nextPostfix}'), 80);
+  new Timer(const Duration(milliseconds: 80),
+      () => resetKey(key, '${theClass}${postfix}',
+      '${theClass}${nextPostfix}'));
 }
 
 void resetKey(Element key, String classToRemove, [String classToAdd = ""]) {
   if (key != null) {
     key.classes.remove(classToRemove);
     if (classToAdd.length > 0) {
       key.classes.add(classToAdd);
-      window.setTimeout(() => resetKey(key, classToAdd), 80);
+      new Timer(const Duration(milliseconds: 80),
+          () => resetKey(key, classToAdd));
     }
   }
 }
 
 void main() {
   final Element element = new Element.tag('div');
 
   // Create our Tape UI.
   tapeUI = new TapeUI();
   element.children.add(tapeUI.root);        // Render the UI
 
   // Create our tape controller.
   tape = new Tape();
 
   renderPad(element);
 
   // Render the UI.
   document.body.children.add(element);
 
   currentRegister = "";
   total = 0.0;
 
   setupEvents();
 }