Introduce ConstructorEntity

pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart

 // Copyright (c) 2014, 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.js_emitter.interceptor_stub_generator;
 
 import '../compiler.dart' show Compiler;
 import '../constants/values.dart';
 import '../elements/entities.dart';
 import '../elements/types.dart' show InterfaceType;
@@ skipping 386 matching lines @@
         //       A.foo() {}
         //       A.bar() {}
         //     }
         //
         // Which are described by the map
         //
         //     {"": A.A$, "foo": A.A$foo, "bar": A.A$bar}
         //
         // We expect most of the time the map will be a singleton.
         var properties = [];
-        for (FunctionEntity member in analysis.constructors(classElement)) {
+        for (ConstructorEntity member in analysis.constructors(classElement)) {
           properties.add(new jsAst.Property(js.string(member.name),
               backend.emitter.staticFunctionAccess(member)));
         }
 
         var map = new jsAst.ObjectInitializer(properties);
         elements.add(map);
       }
     }
 
     return new jsAst.ArrayInitializer(elements);
   }
 }