Reapply remove setTimeout, take 3.

tools/dom/templates/html/dartium/impl_Window.darttemplate

-// 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.
-
-part of $LIBRARYNAME;
-
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-
-  /**
-   * Executes a [callback] after the immediate execution stack has completed.
-   *
-   * This will cause the callback to be executed after all processing has
-   * completed for the current event, but before any subsequent events.
-   */
-  void setImmediate(TimeoutHandler callback) {
-    _addMicrotaskCallback(callback);
-  }
-
-  /**
-   * Lookup a port by its [name].  Return null if no port is
-   * registered under [name].
-   */
-  lookupPort(String name) {
-    var port = json.parse(document.documentElement.attributes['dart-port:$name']);
-    return _deserialize(port);
-  }
-
-  /**
-   * Register a [port] on this window under the given [name].  This
-   * port may be retrieved by any isolate (or JavaScript script)
-   * running in this window.
-   */
-  registerPort(String name, var port) {
-    var serialized = _serialize(port);
-    document.documentElement.attributes['dart-port:$name'] = json.stringify(serialized);
-  }
-
-  /// Checks if _setImmediate is supported.
-  static bool get _supportsSetImmediate => false;
-
-  /// Dartium stub for IE's setImmediate.
-  void _setImmediate(void callback()) {
-    throw new UnsupportedError('setImmediate is not supported');
-  }
-
-$!MEMBERS
-}