Move kernel baseline tests to front_end.

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

-library;
-import self as self;
-import "dart:core" as core;
-
-class Super extends core::Object {
-  constructor arg0() → void
-    ;
-  constructor arg1(dynamic a) → void
-    ;
-  constructor arg2(dynamic a, dynamic b) → void
-    ;
-}
-class Sub extends self::Super {
-  field dynamic field;
-  constructor arg0() → void
-    ;
-  constructor arg1(dynamic a) → void
-    ;
-  constructor arg2(dynamic a, dynamic b) → void
-    ;
-}