Move ElementEnvironment.isSubtype to DartTypes

pkg/compiler/lib/src/js_backend/backend.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 js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenImpact, CodegenWorkItem;
@@ skipping 810 matching lines @@
   }
 
   ResolutionEnqueuer createResolutionEnqueuer(
       CompilerTask task, Compiler compiler) {
     _nativeBasicData =
         nativeBasicDataBuilder.close(compiler.elementEnvironment);
     _nativeResolutionEnqueuer = new native.NativeResolutionEnqueuer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
+        compiler.frontEndStrategy.dartTypes,
         backendUsageBuilder,
         compiler.frontEndStrategy.createNativeClassFinder(nativeBasicData));
     _nativeDataBuilder = new NativeDataBuilderImpl(nativeBasicData);
     _customElementsResolutionAnalysis = compiler.frontEndStrategy
         .createCustomElementsResolutionAnalysis(
             nativeBasicData, backendUsageBuilder);
     impactTransformer = new JavaScriptImpactTransformer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
@@ skipping 53 matching lines @@
         compiler.elementEnvironment,
         commonElements,
         lookupMapResolutionAnalysis);
     _mirrorsCodegenAnalysis = mirrorsResolutionAnalysis.close();
     _customElementsCodegenAnalysis = new CustomElementsCodegenAnalysis(
         compiler.resolution, constantSystem, commonElements, nativeBasicData);
     _nativeCodegenEnqueuer = new native.NativeCodegenEnqueuer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
+        compiler.frontEndStrategy.dartTypes,
         emitter,
         _nativeResolutionEnqueuer,
         closedWorld.nativeData);
     return new CodegenEnqueuer(
         task,
         compiler.options,
         const TreeShakingEnqueuerStrategy(),
         new CodegenWorldBuilderImpl(
             nativeBasicData, closedWorld, constants, const TypeMaskStrategy()),
         new CodegenWorkItemBuilder(this, closedWorld, compiler.options),
@@ skipping 533 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }