All strong mode cleaning of dart2js.

tests/compiler/dart2js/kernel/closed_world_test.dart

 // Copyright (c) 2016, 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.
 
 // Tests that the closed world computed from [WorldImpact]s derived from kernel
 // is equivalent to the original computed from resolution.
 library dart2js.kernel.closed_world_test;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/common_elements.dart';
-import 'package:compiler/src/common/backend_api.dart';
-import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/common/work.dart';
 import 'package:compiler/src/compiler.dart';
-import 'package:compiler/src/elements/resolution_types.dart';
-import 'package:compiler/src/elements/elements.dart';
-import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/enqueue.dart';
 import 'package:compiler/src/js_backend/backend.dart';
 import 'package:compiler/src/js_backend/backend_usage.dart';
 import 'package:compiler/src/js_backend/interceptor_data.dart';
 import 'package:compiler/src/js_backend/resolution_listener.dart';
 import 'package:compiler/src/js_backend/type_variable_handler.dart';
-import 'package:compiler/src/ssa/kernel_impact.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
 import 'package:compiler/src/universe/world_builder.dart';
 import 'package:compiler/src/universe/world_impact.dart';
 import 'package:compiler/src/world.dart';
-import 'impact_test.dart';
 import '../memory_compiler.dart';
 import '../serialization/helper.dart';
-import '../serialization/model_test_helper.dart';
 import '../equivalence/check_functions.dart';
 import 'test_helpers.dart';
 
 const SOURCE = const {
   'main.dart': '''
 abstract class A {
   // redirecting factory in abstract class to other class
   factory A.a() = D.a;
   // redirecting factory in abstract class to factory in abstract class
   factory A.b() = B.a;
@@ skipping 65 matching lines @@
             interceptorDataBuilder,
             backendUsageBuilder,
             const OpenWorldStrategy()),
         new KernelTestWorkItemBuilder(compiler),
         'enqueuer from kernel');
     ClosedWorld closedWorld = computeClosedWorld(compiler.reporter, enqueuer,
         compiler.frontendStrategy.elementEnvironment);
     BackendUsage backendUsage = backendUsageBuilder.close();
     checkResolutionEnqueuers(
         backendUsage, backendUsage, compiler.enqueuer.resolution, enqueuer,
-        typeEquivalence: (ResolutionDartType a, ResolutionDartType b) {
-      return areTypesEquivalent(unalias(a), unalias(b));
-    },
+        typeEquivalence: (a, b) => areTypesEquivalent(unalias(a), unalias(b)),
         elementFilter: elementFilter,
         verbose: arguments.verbose,
         // TODO(johnniwinther): Support class usage testing in presence of
         // redirecting constructors.
         skipClassUsageTesting: true);
     checkClosedWorlds(
         compiler.resolutionWorldBuilder.closedWorldForTesting, closedWorld,
         verbose: arguments.verbose);
   });
 }
@@ skipping 33 matching lines @@
 
 ClosedWorld computeClosedWorld(DiagnosticReporter reporter,
     ResolutionEnqueuer enqueuer, ElementEnvironment elementEnvironment) {
   enqueuer.open(const ImpactStrategy(), elementEnvironment.mainFunction,
       elementEnvironment.libraries);
   enqueuer.forEach((WorkItem work) {
     enqueuer.applyImpact(work.run(), impactSource: work.element);
   });
   return enqueuer.worldBuilder.closeWorld();
 }