fixes #616, statics on callable functions

test/codegen_expected/corelib/apply_test.js

Index: test/codegen_expected/corelib/apply_test.js
diff --git a/test/codegen_expected/corelib/apply_test.js b/test/codegen_expected/corelib/apply_test.js
index 9ba6a80dfe5143f6bb7d0282bcadaba0fab67467..2f3d40169bbab80bcb0c65cafa8a8071ab3620a7 100644
--- a/test/codegen_expected/corelib/apply_test.js
+++ b/test/codegen_expected/corelib/apply_test.js
@@ -65,9 +65,8 @@ dart_library.library('corelib/apply_test', null, /* Imports */[
     methods: () => ({foo: dart.definiteFunctionType(core.int, [dart.dynamic])})
   });
   apply_test.Callable = dart.callableClass(function Callable(...args) {
-    const self = this;
     function call(...args) {
-      return self.call.apply(self, args);
+      return call.call.apply(call, args);
     }
     call.__proto__ = this.__proto__;
     call.new.apply(call, args);