Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/issue_000068.dart.outline.expect

-library;
-import self as self;
-import "dart:core" as core;
-
-class G<T extends core::Object> extends core::Object {
-  constructor •() → void
-    ;
-}
-class A extends core::Object {
-  constructor •() → void
-    ;
-}
-class B extends self::A {
-  constructor •() → void
-    ;
-}
-class C extends self::B {
-  constructor •() → void
-    ;
-}
-static method main() → dynamic
-  ;