Compute WorldImpact in NativeEnqueuer.

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 832 matching lines @@
                       selfTask.measureSubtask(
                           "work.run", () => work.run(this, enqueuer)),
                       impactSource: work.element);
                 }));
       });
     });
   }
 
   void processQueue(Enqueuer enqueuer, Element main) {
     selfTask.measureSubtask("Compiler.processQueue", () {
-      WorldImpactBuilderImpl nativeImpact = new WorldImpactBuilderImpl();
-      enqueuer.nativeEnqueuer
-          .processNativeClasses(nativeImpact, libraryLoader.libraries);
-      enqueuer.applyImpact(impactStrategy, nativeImpact);
+      enqueuer.applyImpact(
+          impactStrategy,
+          enqueuer.nativeEnqueuer
+              .processNativeClasses(libraryLoader.libraries));
       if (main != null && !main.isMalformed) {
         FunctionElement mainMethod = main;
         mainMethod.computeType(resolution);
         if (mainMethod.functionSignature.parameterCount != 0) {
           // The first argument could be a list of strings.
           backend.backendClasses.listImplementation.ensureResolved(resolution);
           enqueuer.registerInstantiatedType(
               backend.backendClasses.listImplementation.rawType);
           backend.backendClasses.stringImplementation
               .ensureResolved(resolution);
@@ skipping 1391 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }