Handle js interop members in impact computation.

pkg/compiler/lib/src/resolution/resolution_strategy.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.resolution_strategy;
 
 import 'package:front_end/src/fasta/scanner.dart' show Token;
 
 import '../../compiler_new.dart' as api;
 import '../common.dart';
@@ skipping 887 matching lines @@
             }
 
             if (fn.isFactoryConstructor && isAnonymous) {
               fn.functionSignature.orderedForEachParameter((_parameter) {
                 ParameterElement parameter = _parameter;
                 if (!parameter.isNamed) {
                   _compiler.reporter.reportErrorMessage(
                       parameter,
                       MessageKind
                           .JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS,
-                      {'parameter': parameter.name, 'cls': classElement.name});
+                      {'cls': classElement.name});
                 }
               });
             } else {
               checkFunctionParameters(fn);
             }
           }
         });
       });
     }
 
@@ skipping 33 matching lines @@
 
   @override
   void forEachConstructor(
       covariant ClassElement cls, void f(ConstructorEntity constructor)) {
     cls.constructors.forEach((Element _constructor) {
       ConstructorElement constructor = _constructor;
       f(constructor);
     });
   }
 }