Revert "Zone support for Futures."

sdk/lib/_internal/lib/async_patch.dart

Index: sdk/lib/_internal/lib/async_patch.dart
diff --git a/sdk/lib/_internal/lib/async_patch.dart b/sdk/lib/_internal/lib/async_patch.dart
index 78ce9cd4b918c6bda6eefff9309162d5d3a63c80..9d8b237ef4bea4a38cab51ecaf3c21e29984d3ed 100644
--- a/sdk/lib/_internal/lib/async_patch.dart
+++ b/sdk/lib/_internal/lib/async_patch.dart
@@ -7,23 +7,24 @@
 import 'dart:_isolate_helper' show IsolateNatives, TimerImpl;
 import 'dart:_foreign_helper' show JS, DART_CLOSURE_TO_JS;
 
-patch Timer _createTimer(Duration duration, void callback()) {
-  int milliseconds = duration.inMilliseconds;
-  if (milliseconds < 0) milliseconds = 0;
-  return new TimerImpl(milliseconds, callback);
-}
+patch class Timer {
+  patch factory Timer(Duration duration, void callback()) {
+    int milliseconds = duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
+    return new TimerImpl(milliseconds, callback);
+  }
 
-patch Timer _createPeriodicTimer(Duration duration,
-                                 void callback(Timer timer)) {
-  int milliseconds = duration.inMilliseconds;
-  if (milliseconds < 0) milliseconds = 0;
-  return new TimerImpl.periodic(milliseconds, callback);
+  patch factory Timer.periodic(Duration duration, void callback(Timer timer)) {
+    int milliseconds = duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
+    return new TimerImpl.periodic(milliseconds, callback);
+  }
 }
 
 patch class _AsyncRun {
   patch static void _enqueueImmediate(void callback()) {
     // TODO(9002): don't use the Timer to enqueue the immediate callback.
-    _createTimer(Duration.ZERO, callback);
+    Timer.run(callback);
   }
 }