Revert r16155: unit tests of the dart2js compiler fail.

sdk/lib/_internal/compiler/implementation/lib/isolate_patch.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.
 
 // Patch file for the dart:isolate library.
 
 patch ReceivePort get port {
   if (lazyPort == null) {
     lazyPort = new ReceivePort();
   }
@@ skipping 11 matching lines @@
 
 /** Default factory for receive ports. */
 patch class ReceivePort {
   patch factory ReceivePort() {
     return new ReceivePortImpl();
   }
 }
 
 patch class Timer {
   patch factory Timer(int milliseconds, void callback(Timer timer)) {
-    if (!hasTimer()) {
+    if (!hasWindow()) {
       throw new UnsupportedError("Timer interface not supported.");
     }
     return new TimerImpl(milliseconds, callback);
   }
 
   /**
    * Creates a new repeating timer. The [callback] is invoked every
    * [milliseconds] millisecond until cancelled.
    */
   patch factory Timer.repeating(int milliseconds, void callback(Timer timer)) {
-    if (!hasTimer()) {
+    if (!hasWindow()) {
       throw new UnsupportedError("Timer interface not supported.");
     }
     return new TimerImpl.repeating(milliseconds, callback);
   }
 }