Rename KernelWorldBuilder to KernelElementBuilder

pkg/compiler/lib/src/kernel/native_class_resolver.dart

Index: pkg/compiler/lib/src/kernel/native_class_resolver.dart
diff --git a/pkg/compiler/lib/src/kernel/native_class_resolver.dart b/pkg/compiler/lib/src/kernel/native_class_resolver.dart
index f02d48bd0092af5edbc2949b6ec397920410c8f0..ff7cf1dd572fcf0b1a934e67e3571844255468f9 100644
--- a/pkg/compiler/lib/src/kernel/native_class_resolver.dart
+++ b/pkg/compiler/lib/src/kernel/native_class_resolver.dart
@@ -2,13 +2,13 @@
 // 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.
 
-part of dart2js.kernel.world_builder;
+part of dart2js.kernel.element_builder;
 
 /// Interface for computing all native classes in a set of libraries.
 class KernelNativeClassResolver implements NativeClassResolver {
-  final KernelWorldBuilder _worldBuilder;
+  final KernelElementBuilder _elementBuilder;
 
-  KernelNativeClassResolver(this._worldBuilder);
+  KernelNativeClassResolver(this._elementBuilder);
 
   Iterable<ClassEntity> computeNativeClasses(
       Iterable<LibraryEntity> libraries) {