Move towards using WorldImpact for codegen

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

 // Copyright (c) 2012, 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.common.registry;
 
-import '../dart_types.dart' show InterfaceType;
 import '../elements/elements.dart' show Element;
-import '../enqueue.dart' show Enqueuer;
-import '../universe/use.dart' show DynamicUse, StaticUse;
 
+// TODO(johnniwinther): Remove this.
 /// Interface for registration of element dependencies.
 abstract class Registry {
-  // TODO(johnniwinther): Remove this.
   void registerDependency(Element element) {}
-
-  bool get isForResolution;
-
-  void registerDynamicUse(DynamicUse staticUse);
-
-  void registerStaticUse(StaticUse staticUse);
-
-  void registerInstantiation(InterfaceType type);
 }
-
-// TODO(johnniwinther): Remove this.
-class EagerRegistry extends Registry {
-  final String name;
-  final Enqueuer world;
-
-  EagerRegistry(this.name, this.world);
-
-  bool get isForResolution => world.isResolutionQueue;
-
-  @override
-  void registerDynamicUse(DynamicUse dynamicUse) {
-    world.registerDynamicUse(dynamicUse);
-  }
-
-  @override
-  void registerInstantiation(InterfaceType type) {
-    world.registerInstantiatedType(type);
-  }
-
-  @override
-  void registerStaticUse(StaticUse staticUse) {
-    world.registerStaticUse(staticUse);
-  }
-
-  String toString() => name;
-}