Move Entity and Local to entities.dart

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

 // Copyright (c) 2016, 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.native_data;
 
 import '../common.dart';
 import '../elements/elements.dart'
-    show
-        ClassElement,
-        Element,
-        Entity,
-        FieldElement,
-        FunctionElement,
-        MemberElement;
+    show ClassElement, Element, FieldElement, FunctionElement, MemberElement;
+import '../elements/entities.dart';
 import '../native/behavior.dart' show NativeBehavior;
 
 /// Additional element information for native classes and methods and js-interop
 /// methods.
 class NativeData {
   /// The JavaScript names for elements implemented via typed JavaScript
   /// interop.
   Map<Element, String> jsInteropNames = <Element, String>{};
 
   /// The JavaScript names for native JavaScript elements implemented.
@@ skipping 205 matching lines @@
   }
 
   /// Apply JS$ escaping scheme to convert possible escaped Dart names into
   /// JS names.
   String getUnescapedJSInteropName(String name) {
     return name.startsWith(_jsInteropEscapePrefix)
         ? name.substring(_jsInteropEscapePrefix.length)
         : name;
   }
 }