Extract ClosedWorldRefiner implementation from ClosedWorldImpl to ClosedWorldBase

pkg/compiler/lib/src/js_backend/mirrors_analysis.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 dart2js.mirrors_handler;
 
 import '../common.dart';
 import '../common/resolution.dart';
 import '../compiler.dart';
 import '../constants/values.dart';
@@ skipping 173 matching lines @@
             // Use [enclosingElement] instead of [enclosingClass] to ensure that
             // we process patch class metadata for patch and injected members.
             processElementMetadata(element.enclosingElement);
           }
         } else {
           processLibraryMetadata(element.library);
         }
       }
     }
 
-    entities.forEach(processElementMetadata);
+    entities.forEach((MemberElement member) => processElementMetadata(member));
   }
 
   void onResolutionComplete() {
     _registeredMetadata.clear();
   }
 
   MirrorsCodegenAnalysis close() => new MirrorsCodegenAnalysisImpl(
       _backend, handler._resolution, _metadataConstants);
 }
 
@@ skipping 270 matching lines @@
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 
   String toString() => '$annotatedElement:${constant.toStructuredText()}';
 }