Rename Timer.repeating to Timer.periodic.

runtime/lib/timer_patch.dart

Index: runtime/lib/timer_patch.dart
diff --git a/runtime/lib/timer_patch.dart b/runtime/lib/timer_patch.dart
index fd3efbd8048e06647edbca83ecbe266e6e9a5b2d..2db2343720a1e6ad6e14c7f6b9ea351075bbd68d 100644
--- a/runtime/lib/timer_patch.dart
+++ b/runtime/lib/timer_patch.dart
@@ -12,8 +12,8 @@ patch class Timer {
     return _TimerFactory._factory(milliseconds, (_) { callback(); }, false);
   }
 
-  /* patch */ factory Timer.repeating(Duration duration,
-                                      void callback(Timer timer)) {
+  /* patch */ factory Timer.periodic(Duration duration,
+                                     void callback(Timer timer)) {
     if (_TimerFactory._factory == null) {
       throw new UnsupportedError("Timer interface not supported.");
     }