Check in codegen test expectations.

test/codegen/expect/language/mixin_forwarding_constructor4_test_none_multi.js

Index: test/codegen/expect/language/mixin_forwarding_constructor4_test_none_multi.js
diff --git a/test/codegen/expect/language/mixin_forwarding_constructor4_test_none_multi.js b/test/codegen/expect/language/mixin_forwarding_constructor4_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..467f93d4c6890e3ec029ef3db5ad6a029be7b2ae
--- /dev/null
+++ b/test/codegen/expect/language/mixin_forwarding_constructor4_test_none_multi.js
@@ -0,0 +1,29 @@
+dart_library.library('language/mixin_forwarding_constructor4_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__mixin_forwarding_constructor4_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const mixin_forwarding_constructor4_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  mixin_forwarding_constructor4_test_none_multi.Mixin = class Mixin extends core.Object {};
+  mixin_forwarding_constructor4_test_none_multi.Base = class Base extends core.Object {
+    new() {
+    }
+  };
+  dart.setSignature(mixin_forwarding_constructor4_test_none_multi.Base, {
+    constructors: () => ({new: dart.definiteFunctionType(mixin_forwarding_constructor4_test_none_multi.Base, [])})
+  });
+  mixin_forwarding_constructor4_test_none_multi.C = class C extends dart.mixin(mixin_forwarding_constructor4_test_none_multi.Base, mixin_forwarding_constructor4_test_none_multi.Mixin) {
+    new() {
+      super.new();
+    }
+  };
+  mixin_forwarding_constructor4_test_none_multi.main = function() {
+    new mixin_forwarding_constructor4_test_none_multi.C();
+  };
+  dart.fn(mixin_forwarding_constructor4_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.mixin_forwarding_constructor4_test_none_multi = mixin_forwarding_constructor4_test_none_multi;
+});