Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/duplicated_mixin.dart.dartk.expect

Index: pkg/front_end/test/fasta/rasta/duplicated_mixin.dart.dartk.expect
diff --git a/pkg/front_end/test/fasta/rasta/duplicated_mixin.dart.dartk.expect b/pkg/front_end/test/fasta/rasta/duplicated_mixin.dart.dartk.expect
deleted file mode 100644
index c82df797e40363001bb46ec0a3bcb3255b156b01..0000000000000000000000000000000000000000
--- a/pkg/front_end/test/fasta/rasta/duplicated_mixin.dart.dartk.expect
+++ /dev/null
@@ -1,23 +0,0 @@
-library;
-import self as self;
-import "dart:core" as core;
-
-class Mixin extends core::Object {
-  field dynamic field;
-  constructor •() → self::Mixin
-    : super core::Object::•();
-}
-class A extends self::Object+Mixin+Mixin#0 {
-  constructor •() → self::A
-    : super self::Object+Mixin+Mixin#0::•();
-}
-abstract class Object+Mixin+Mixin#0 extends self::Object+Mixin#0 implements self::Mixin {
-  field dynamic field;
-  constructor •() → dynamic
-    : super self::Object+Mixin#0::•();
-}
-abstract class Object+Mixin#0 extends core::Object implements self::Mixin {
-  field dynamic field;
-  constructor •() → dynamic
-    : super core::Object::•();
-}