Rename KernelWorldBuilder to KernelElementBuilder

tests/compiler/dart2js/serialization/test_helper.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.serialization_test_helper;
 
 import 'dart:collection';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/constants/values.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/elements/resolution_types.dart';
 import 'package:compiler/src/elements/types.dart';
 import 'package:compiler/src/kernel/elements.dart';
-import 'package:compiler/src/kernel/world_builder.dart';
+import 'package:compiler/src/kernel/element_map.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
 import 'package:compiler/src/util/util.dart';
 import 'package:expect/expect.dart';
 import 'test_data.dart';
 
 Check currentCheck;
 
 class Check {
   final Check parent;
   final Object object1;
@@ skipping 610 matching lines @@
   final WorldDeconstructionForTesting testing;
 
   /// Set of mixin applications assumed to be equivalent.
   ///
   /// We need co-inductive reasoning because mixin applications are compared
   /// structurally and therefore, in the case of generic mixin applications,
   /// meet themselves through the equivalence check of their type variables.
   Set<Pair<ClassEntity, ClassEntity>> assumedMixinApplications =
       new Set<Pair<ClassEntity, ClassEntity>>();
 
-  KernelEquivalence(KernelWorldBuilder builder)
+  KernelEquivalence(KernelToElementMap builder)
       : testing = new WorldDeconstructionForTesting(builder);
 
   TestStrategy get defaultStrategy => new TestStrategy(
       elementEquivalence: entityEquivalence, typeEquivalence: typeEquivalence);
 
   bool entityEquivalence(Element a, Entity b, {TestStrategy strategy}) {
     if (identical(a, b)) return true;
     if (a == null || b == null) return false;
     strategy ??= defaultStrategy;
     switch (a.kind) {
@@ skipping 162 matching lines @@
               strategy.testTypeLists(a, b, 'namedParameterTypes',
                   aType.namedParameterTypes, b.namedParameterTypes);
         }
         return false;
       default:
         throw new UnsupportedError('Unsupported equivalence: '
             '$a (${a.runtimeType}) vs $b (${b.runtimeType})');
     }
   }
 }