Unwrap type if needed on dcall

pkg/dev_compiler/lib/js/legacy/dart_sdk.js

Index: pkg/dev_compiler/lib/js/legacy/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
index 303969359ceeb1a46ba1e6a0a382edcc1de61a7f..295dd7fad310c9d3933839e5e42256b798949d2f 100644
--- a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
@@ -1989,6 +1989,9 @@ dart_library.library('dart_sdk', null, /* Imports */[
     return dart.noSuchMethod(obj, new dart.InvocationImpl(field, [value], {isSetter: true}));
   };
   dart._checkApply = function(type, actuals) {
+    if (type instanceof Array) {
+      type = type[0];
+    }
     if (actuals.length < type.args.length) return false;
     let index = 0;
     for (let i = 0; i < type.args.length; ++i) {