Move dart_types to elements/resolution_types

pkg/compiler/lib/src/native/enqueue.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.
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/backend_api.dart' show ForeignResolver;
 import '../common/resolution.dart' show Resolution;
 import '../compiler.dart' show Compiler;
 import '../constants/values.dart';
 import '../core_types.dart' show CommonElements;
-import '../dart_types.dart';
+import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart' show FunctionElementX;
 import '../js_backend/backend_helpers.dart' show BackendHelpers;
 import '../js_backend/js_backend.dart';
 import '../js_emitter/js_emitter.dart' show CodeEmitterTask, NativeEmitter;
 import '../tokens/token.dart' show BeginGroupToken, Token;
 import '../tokens/token_constants.dart' as Tokens show EOF_TOKEN;
 import '../tree/tree.dart';
 import '../universe/use.dart' show StaticUse, TypeUse;
 import '../universe/world_impact.dart'
@@ skipping 638 matching lines @@
     List<Element> directSubtypes =
         emitter.directSubtypes.putIfAbsent(superclass, () => <ClassElement>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(log(message)) {
     log('Compiled ${_registeredClasses.length} native classes, '
         '${_unusedClasses.length} native classes omitted.');
   }
 }