Use entities in code_emitter_task

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, 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 js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 2181 matching lines @@
     jsAst.Expression dispatchProperty =
         emitter.generateEmbeddedGlobalAccess(dispatchPropertyName);
 
     // We pass the dispatch property record to the isJsIndexable
     // helper rather than reading it inside the helper to increase the
     // chance of making the dispatch record access monomorphic.
     jsAst.PropertyAccess record =
         new jsAst.PropertyAccess(use2, dispatchProperty);
 
     List<jsAst.Expression> arguments = <jsAst.Expression>[use1, record];
-    FunctionElement helper = helpers.isJsIndexable;
+    MethodElement helper = helpers.isJsIndexable;
     jsAst.Expression helperExpression = emitter.staticFunctionAccess(helper);
     return new jsAst.Call(helperExpression, arguments);
   }
 
   /// Returns all static fields that are referenced through [targetsUsed].
   /// If the target is a library or class all nested static fields are
   /// included too.
   Iterable<Element> _findStaticFieldTargets() {
     List staticFields = [];
 
@@ skipping 1073 matching lines @@
   @override
   bool isNativeClass(ClassElement element) {
     return helpers.backend.isNative(element);
   }
 
   @override
   bool isNativeMember(MemberElement element) {
     return helpers.backend.isNative(element);
   }
 }