Unwrap type if needed on dcall

pkg/dev_compiler/lib/js/amd/dart_sdk.js

Index: pkg/dev_compiler/lib/js/amd/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/amd/dart_sdk.js b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
index 5494cb67b1b86e62378a6446d527c20970a5dbf0..b6da6fe94b83b59071f73e131a3fc186a5e93925 100644
--- a/pkg/dev_compiler/lib/js/amd/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
@@ -1988,6 +1988,9 @@ define([], function() {
     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) {