Resynthesize _DeferredClassElement lazily.

pkg/analyzer/test/src/summary/resynthesize_test.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 test.src.serialization.elements_test;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
@@ skipping 193 matching lines @@
       }
     } else {
       expect(
           resynthesizedNonHandle, isNot(new isInstanceOf<ConstructorMember>()),
           reason: desc);
     }
   }
 
   void compareClassElements(
       ClassElement resynthesized, ClassElement original, String desc) {
-    ClassElementImpl r = getActualElement(resynthesized, desc);
-    ClassElementImpl o = getActualElement(original, desc);
+    ClassElementImpl r = ClassElementImpl.getImpl(resynthesized);
+    ClassElementImpl o = ClassElementImpl.getImpl(original);
     compareElements(r, o, desc);
     expect(r.fields.length, o.fields.length, reason: '$desc fields.length');
     for (int i = 0; i < r.fields.length; i++) {
       String name = o.fields[i].name;
       compareFieldElements(r.fields[i], o.fields[i], '$desc.field $name');
     }
     compareTypes(r.supertype, o.supertype, '$desc supertype');
     expect(r.interfaces.length, o.interfaces.length);
     for (int i = 0; i < r.interfaces.length; i++) {
       compareTypes(r.interfaces[i], o.interfaces[i],
@@ skipping 4205 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }