Revert "Zone support for Futures."

runtime/lib/timer_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 Timer _createTimer(Duration duration, void callback()) {
-  if (_TimerFactory._factory == null) {
-    throw new UnsupportedError("Timer interface not supported.");
+patch class Timer {
+  /* patch */ factory Timer(Duration duration, void callback()) {
+    if (_TimerFactory._factory == null) {
+      throw new UnsupportedError("Timer interface not supported.");
+    }
+    int milliseconds = duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
+    return _TimerFactory._factory(milliseconds, (_) { callback(); }, false);
   }
-  int milliseconds = duration.inMilliseconds;
-  if (milliseconds < 0) milliseconds = 0;
-  return _TimerFactory._factory(milliseconds, (_) { callback(); }, false);
+
+  /* patch */ factory Timer.periodic(Duration duration,
+                                     void callback(Timer timer)) {
+    if (_TimerFactory._factory == null) {
+      throw new UnsupportedError("Timer interface not supported.");
+    }
+    int milliseconds = duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
+    return _TimerFactory._factory(milliseconds, callback, true);
+  }
 }
 
-patch Timer _createPeriodicTimer(Duration duration,
-                                 void callback(Timer timer)) {
-  if (_TimerFactory._factory == null) {
-    throw new UnsupportedError("Timer interface not supported.");
-  }
-  int milliseconds = duration.inMilliseconds;
-  if (milliseconds < 0) milliseconds = 0;
-  return _TimerFactory._factory(milliseconds, callback, true);
-}
-
-
 typedef Timer _TimerFactoryClosure(int milliseconds,
                                    void callback(Timer timer),
                                    bool repeating);
 
 class _TimerFactory {
   static _TimerFactoryClosure _factory;
 }
 
 // TODO(ahe): Warning: this is NOT called by Dartium. Instead, it sets
 // [_TimerFactory._factory] directly.
 void _setTimerFactoryClosure(_TimerFactoryClosure closure) {
   _TimerFactory._factory = closure;
 }