Revert "Implement call operator."

lib/compiler/implementation/lib/js_helper.dart

Index: lib/compiler/implementation/lib/js_helper.dart
diff --git a/lib/compiler/implementation/lib/js_helper.dart b/lib/compiler/implementation/lib/js_helper.dart
index 7fe30c955972365a8b45593551be418836ff75a0..05805412ce592b67d0b9792754d669d9d9fe689f 100644
--- a/lib/compiler/implementation/lib/js_helper.dart
+++ b/lib/compiler/implementation/lib/js_helper.dart
@@ -794,13 +794,13 @@ unwrapException(ex) {
         type == 'called_non_callable' ||
         type == 'non_object_property_call' ||
         type == 'non_object_property_load') {
-      if (name is String && name.startsWith(@'call$')) {
+      if (name is String && name.startsWith(@'$call$')) {
         return new ObjectNotClosureException();
       } else {
         return new NullPointerException();
       }
     } else if (type == 'undefined_method') {
-      if (name is String && name.startsWith(@'call$')) {
+      if (name is String && name.startsWith(@'$call$')) {
         return new ObjectNotClosureException();
       } else {
         return new NoSuchMethodException('', name, []);