dart2js: Fix types in new emitter.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.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.new_js_emitter.model_emitter;
 
 import '../../dart2jslib.dart' show Compiler;
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
@@ skipping 277 matching lines @@
 
     List<js.Statement> instantiations =
         libraries.expand((Library library) => library.classes)
                  .where((Class cls) => cls.isEager)
                  .map(createInstantiation)
                  .toList(growable: false);
     return new js.Block(instantiations);
   }
 
   js.Expression emitLibrary(Library library) {
-    Iterable staticDescriptors = library.statics.expand((e) =>
+    Iterable staticDescriptors = library.statics.expand((StaticMethod e) =>
         [ js.string(e.name), js.number(e.holder.index), emitStaticMethod(e) ]);
-    Iterable classDescriptors = library.classes.expand((e) =>
+    Iterable classDescriptors = library.classes.expand((Class e) =>
         [ js.string(e.name), js.number(e.holder.index), emitClass(e) ]);
 
     js.Expression staticArray =
         new js.ArrayInitializer(staticDescriptors.toList(growable: false));
     js.Expression classArray =
         new js.ArrayInitializer(classDescriptors.toList(growable: false));
 
     return new js.ArrayInitializer([staticArray, classArray]);
   }
 
@@ skipping 280 matching lines @@
 
   var end = Date.now();
   print('Setup: ' + (end - start) + ' ms.');
 
   #main();  // Start main.
 
 }(Date.now(), #code)
 }""";
 
 }