Move kernel baseline tests to front_end.

pkg/front_end/testcases/argument.dart.outline.expect

Index: pkg/front_end/testcases/argument.dart.outline.expect
diff --git a/pkg/front_end/testcases/argument.dart.outline.expect b/pkg/front_end/testcases/argument.dart.outline.expect
new file mode 100644
index 0000000000000000000000000000000000000000..b270ee0d1e467d6a4fab86f1b168a7f75829ec3c
--- /dev/null
+++ b/pkg/front_end/testcases/argument.dart.outline.expect
@@ -0,0 +1,32 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+abstract class Base extends core::Object {
+  constructor •() → void
+    ;
+}
+class Foo extends self::Base {
+  constructor •() → void
+    ;
+}
+class Bar extends self::Base {
+  constructor •() → void
+    ;
+}
+class Baz extends self::Base {
+  constructor •() → void
+    ;
+}
+static method foo(dynamic x) → void
+  ;
+static method bar(dynamic x) → void
+  ;
+static method foo_escaped(dynamic x) → void
+  ;
+static method bar_escaped(dynamic x) → void
+  ;
+static method escape(dynamic fn) → void
+  ;
+static method main() → dynamic
+  ;