Extract ClosedWorldRefiner implementation from ClosedWorldImpl to ClosedWorldBase

pkg/compiler/lib/src/closure.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 closureToClassMapper;
 
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show ParsingContext, Resolution;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
@@ skipping 35 matching lines @@
       ClosureClassMap closureClassMap = _closureMappingCache[element];
       assert(invariant(resolvedAst.element, closureClassMap != null,
           message: "No ClosureClassMap computed for ${element}."));
       return closureClassMap;
     });
   }
 
   /// Create [ClosureClassMap]s for all live members.
   void createClosureClasses(ClosedWorldRefiner closedWorldRefiner) {
     compiler.enqueuer.resolution.processedEntities
-        .forEach((AstElement element) {
-      // TODO(johnniwinther): Typedefs should never be in processedElements.
-      if (element.isTypedef) return;
+        .forEach((MemberElement element) {
       ResolvedAst resolvedAst = element.resolvedAst;
       if (element.isAbstract) return;
       if (element.isField &&
           !element.isInstanceMember &&
           resolvedAst.body == null) {
         // Skip top-level/static fields without an initializer.
         return;
       }
       computeClosureToClassMapping(resolvedAst, closedWorldRefiner);
     });
@@ skipping 1155 matching lines @@
 ///
 /// Move the below classes to a JS model eventually.
 ///
 abstract class JSEntity implements Entity {
   Entity get declaredEntity;
 }
 
 abstract class PrivatelyNamedJSEntity implements JSEntity {
   Entity get rootOfScope;
 }