Update golden files.

pkg/front_end/testcases/external.dart.direct.expect

Index: pkg/front_end/testcases/external.dart.direct.expect
diff --git a/pkg/front_end/testcases/external.dart.direct.expect b/pkg/front_end/testcases/external.dart.direct.expect
index 74c2005687db45166e67a6179151d6a248415ab0..48a61ed752949fdd9bca88f3bcd1da12d65dcdd1 100644
--- a/pkg/front_end/testcases/external.dart.direct.expect
+++ b/pkg/front_end/testcases/external.dart.direct.expect
@@ -3,14 +3,14 @@ import self as self;
 import "dart:core" as core;
 import "dart:isolate" as iso;
 
-static field dynamic subscription = null;
+static field dynamic subscription;
 static method onData(dynamic x) → void {
   core::print(x);
   self::subscription.cancel();
 }
 static method main() → dynamic {
   dynamic string = core::String::fromCharCode(65);
-  dynamic port = iso::ReceivePort::•();
+  dynamic port = new iso::_ReceivePortImpl::•();
   self::subscription = port.listen(self::onData);
   port.sendPort.send(string);
 }