Fix void foo(..) => ... to use { } instead.

sdk/lib/async/stream_transformers.dart

Index: sdk/lib/async/stream_transformers.dart
diff --git a/sdk/lib/async/stream_transformers.dart b/sdk/lib/async/stream_transformers.dart
index ea4aaf73a392fb1e6470453a00819ab5afef3025..979ce3a6a5c114690d2c8bbb40b64ba89ddb87dc 100644
--- a/sdk/lib/async/stream_transformers.dart
+++ b/sdk/lib/async/stream_transformers.dart
@@ -213,10 +213,11 @@ class _HandlerEventSink<S, T> implements EventSink<S> {
   _HandlerEventSink(this._handleData, this._handleError, this._handleDone,
                     this._sink);
 
-  void add(S data) => _handleData(data, _sink);
-  void addError(Object error, [StackTrace stackTrace])
-      => _handleError(error, stackTrace, _sink);
-  void close() => _handleDone(_sink);
+  void add(S data) { _handleData(data, _sink); }
+  void addError(Object error, [StackTrace stackTrace]) {
+    _handleError(error, stackTrace, _sink);
+  }
+  void close() { _handleDone(_sink); }
 }
 
 /**