Use entities in CommonElements interface.

pkg/compiler/lib/src/resolution/class_hierarchy.dart

 // Copyright (c) 2015, 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.resolution.class_hierarchy;
 
 import '../common.dart';
 import '../common/resolution.dart' show Resolution;
 import '../core_types.dart' show CommonElements;
 import '../elements/resolution_types.dart';
@@ skipping 23 matching lines @@
   TypeDeclarationElement get element => enclosingElement;
 
   TypeDefinitionVisitor(Resolution resolution, TypeDeclarationElement element,
       ResolutionRegistry registry)
       : this.enclosingElement = element,
         scope = Scope.buildEnclosingScope(element),
         super(resolution, registry);
 
   CommonElements get commonElements => resolution.commonElements;
 
-  ResolutionDartType get objectType => commonElements.objectType;
+  ResolutionInterfaceType get objectType => commonElements.objectType;
 
   void resolveTypeVariableBounds(NodeList node) {
     if (node == null) return;
 
     Setlet<String> nameSet = new Setlet<String>();
     // Resolve the bounds of type variables.
     Iterator<ResolutionDartType> types = element.typeVariables.iterator;
     Link<Node> nodeLink = node.nodes;
     while (!nodeLink.isEmpty) {
       types.moveNext();
@@ skipping 588 matching lines @@
     Identifier selector = node.selector.asIdentifier();
     var e = prefixElement.lookupLocalMember(selector.source);
     if (e == null || !e.impliesType) {
       reporter.reportErrorMessage(node.selector,
           MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.selector});
       return;
     }
     loadSupertype(e, node);
   }
 }