Update return type of dart2js patch of dart:developer.log.

sdk/lib/developer/developer.dart

Index: sdk/lib/developer/developer.dart
diff --git a/sdk/lib/developer/developer.dart b/sdk/lib/developer/developer.dart
index 861c34b6cf75d69f98a34085be5f38ba836c78e6..c51a6803a084a946f32baa5a640e54c0f78ab80d 100644
--- a/sdk/lib/developer/developer.dart
+++ b/sdk/lib/developer/developer.dart
@@ -45,10 +45,10 @@ external Object inspect(Object object);
 /// [error] (optional) an error object associated with this log event.
 /// [stackTrace] (optional) a stack trace associated with this log event.
 external void log(String message,
-             {DateTime time,
-              int sequenceNumber,
-              int level: 0,
-              String name: '',
-              Zone zone,
-              Object error,
-              StackTrace stackTrace});
+                  {DateTime time,
+                   int sequenceNumber,
+                   int level: 0,
+                   String name: '',
+                   Zone zone,
+                   Object error,
+                   StackTrace stackTrace});