Use entities in ClosedWorld interface

pkg/compiler/lib/src/ssa/builder.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.
 
 import 'dart:collection';
 
 import 'package:js_runtime/shared/embedded_names.dart';
 
 import '../closure.dart';
 import '../common.dart';
@@ skipping 3988 matching lines @@
       if (selector.isIndex) return true;
       if (selector.isIndexSet) return true;
       if (element == helpers.jsArrayAdd ||
           element == helpers.jsArrayRemoveLast ||
           element == helpers.jsStringSplit) {
         return true;
       }
       return false;
     }
 
-    Element element = closedWorld.locateSingleElement(selector, mask);
+    MemberElement element = closedWorld.locateSingleElement(selector, mask);
     if (element != null &&
         !element.isField &&
         !(element.isGetter && selector.isCall) &&
         !(element.isFunction && selector.isGetter) &&
         !isOptimizableOperation(selector, element)) {
       if (tryInlineMethod(element, selector, mask, arguments, node)) {
         return;
       }
     }
 
@@ skipping 2735 matching lines @@
       this.oldReturnLocal,
       this.oldReturnType,
       this.oldResolvedAst,
       this.oldStack,
       this.oldLocalsHandler,
       this.inTryStatement,
       this.allFunctionsCalledOnce,
       this.oldElementInferenceResults)
       : super(function);
 }