Use entities in class_stub_generator.

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

Index: pkg/compiler/lib/src/js_emitter/native_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/native_emitter.dart b/pkg/compiler/lib/src/js_emitter/native_emitter.dart
index a3ba7518b930535994e0a9e2c76af4b75a4cf50f..aae95f91d6bb71d6514ff796b4e19e045ae1187e 100644
--- a/pkg/compiler/lib/src/js_emitter/native_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/native_emitter.dart
@@ -7,22 +7,18 @@ library dart2js.js_emitter.native_emitter;
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../elements/resolution_types.dart'
-    show
-    ResolutionDartType,
-    ResolutionFunctionType;
+    show ResolutionDartType, ResolutionFunctionType;
 import '../elements/elements.dart'
     show
-    ClassElement,
-    Element,
-    FunctionElement,
-    FunctionSignature,
-    ParameterElement;
+        ClassElement,
+        Element,
+        FunctionElement,
+        FunctionSignature,
+        ParameterElement;
 import '../js/js.dart' as jsAst;
 import '../js/js.dart' show js;
 import '../js_backend/backend_helpers.dart' show BackendHelpers;
-import '../js_backend/js_backend.dart'
-    show
-    JavaScriptBackend;
+import '../js_backend/js_backend.dart' show JavaScriptBackend;
 import 'full_emitter/emitter.dart' as full_js_emitter;
 
 import 'code_emitter_task.dart' show CodeEmitterTask;