Split implementation of KernelToElementMapImpl

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

 // Copyright (c) 2017, 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.
 
 // TODO(johnniwinther): Make this a separate library.
 part of dart2js.kernel.element_map;
 
 class KernelAnnotationProcessor implements AnnotationProcessor {
-  final KernelToElementMapImpl elementMap;
+  final KernelToElementMapForImpactImpl2 elementMap;
 
   KernelAnnotationProcessor(this.elementMap);
 
   void extractNativeAnnotations(
       LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder) {
     ElementEnvironment elementEnvironment = elementMap.elementEnvironment;
     CommonElements commonElements = elementMap.commonElements;
 
     elementEnvironment.forEachClass(library, (ClassEntity cls) {
       String annotationName;
@@ skipping 19 matching lines @@
       LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder) {
     // TODO(redemption): Implement this.
   }
 
   @override
   void processJsInteropAnnotations(
       NativeBasicData nativeData, NativeDataBuilder nativeDataBuilder) {
     // TODO(redemption): Implement this.
   }
 }