Move towards using WorldImpact for codegen

pkg/compiler/lib/src/resolution/registry.dart

 // Copyright (c) 2014, 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.resolution.registry;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show Backend, ForeignResolver, NativeRegistry;
 import '../common/registry.dart' show Registry;
 import '../common/resolution.dart' show ResolutionImpact, Target;
 import '../constants/expressions.dart';
 import '../dart_types.dart';
 import '../diagnostics/source_span.dart';
 import '../elements/elements.dart';
 import '../tree/tree.dart';
 import '../universe/call_structure.dart' show CallStructure;
 import '../universe/feature.dart';
 import '../universe/selector.dart' show Selector;
 import '../universe/use.dart' show DynamicUse, StaticUse, TypeUse;
-import '../universe/world_impact.dart' show WorldImpact, WorldImpactBuilder;
+import '../universe/world_impact.dart' show WorldImpact, WorldImpactBuilderImpl;
 import '../util/enumset.dart' show EnumSet;
 import '../util/util.dart' show Setlet;
 import 'members.dart' show ResolverVisitor;
 import 'send_structure.dart';
 import 'tree_elements.dart' show TreeElementMapping;
 
-class ResolutionWorldImpactBuilder extends ResolutionImpact
-    with WorldImpactBuilder
-    implements NativeRegistry {
+class ResolutionWorldImpactBuilder extends WorldImpactBuilderImpl
+    implements NativeRegistry, ResolutionImpact {
   final String name;
   EnumSet<Feature> _features;
   Setlet<MapLiteralUse> _mapLiterals;
   Setlet<ListLiteralUse> _listLiterals;
   Setlet<String> _constSymbolNames;
   Setlet<ConstantExpression> _constantLiterals;
   Setlet<dynamic> _nativeData;
 
   ResolutionWorldImpactBuilder(this.name);
 
@@ skipping 382 matching lines @@
   @override
   void registerInstantiatedType(InterfaceType type) {
     registry.registerInstantiation(type);
   }
 
   @override
   DartType resolveTypeFromString(Node node, String typeName) {
     return visitor.resolveTypeFromString(node, typeName);
   }
 }