Rename Timer.repeating to Timer.periodic.

sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart

Index: sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart b/sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart
index f33154dc95d642cc791d8b8bd0f378c2dfe87717..5b09ac9e1fe5b36c3ced6ec19a291fa0542ea919 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/isolate_helper.dart
@@ -1318,7 +1318,7 @@ class TimerImpl implements Timer {
     }
   }
 
-  TimerImpl.repeating(int milliseconds, void callback(Timer timer))
+  TimerImpl.periodic(int milliseconds, void callback(Timer timer))
       : _once = false {
     if (hasTimer()) {
       _globalState.topEventLoop.activeTimerCount++;
@@ -1327,7 +1327,7 @@ class TimerImpl implements Timer {
                    convertDartClosureToJS(() { callback(this); }, 0),
                    milliseconds);
     } else {
-      throw new UnsupportedError("Repeating timer.");
+      throw new UnsupportedError("Periodic timer.");
     }
   }