Update rasta outline expectations.

pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect

Index: pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect
diff --git a/pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect b/pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect
index 94c244e375a3410cb7d40e831dccf6cdca34a9a7..4fbe7d2bd44ee97df57b1747251b7480fd470d33 100644
--- a/pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect
+++ b/pkg/front_end/test/fasta/rasta/abstract_constructor.dart.outline.expect
@@ -3,9 +3,8 @@ import self as self;
 import "dart:core" as core;
 
 abstract class C extends core::Object {
-  constructor •() → self::C
-    : super core::Object::•();
-}
-static method main() → dynamic {
-  invalid-expression;
+  constructor •() → void
+    ;
 }
+static method main() → dynamic
+  ;