| Index: sdk/lib/developer/extension.dart | 
| diff --git a/sdk/lib/developer/extension.dart b/sdk/lib/developer/extension.dart | 
| index 5883fb58a921938ecb7f37c09aa70b4f2637fdd5..e50a88d8f356f245f702847c870a9c1fcf64cda4 100644 | 
| --- a/sdk/lib/developer/extension.dart | 
| +++ b/sdk/lib/developer/extension.dart | 
| @@ -166,7 +166,7 @@ void postEvent(String eventKind, Map eventData) { | 
| _postEvent(eventKind, eventDataAsString); | 
| } | 
|  | 
| -external _postEvent(String eventKind, String eventData); | 
| +external void _postEvent(String eventKind, String eventData); | 
|  | 
| // Both of these functions are written inside C++ to avoid updating the data | 
| // structures in Dart, getting an OOB, and observing stale state. Do not move | 
|  |