Remove Frontend interface

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;
 import '../common/names.dart' show Uris;
-import '../common/resolution.dart'
-    show Frontend, Resolution, ResolutionImpact, Target;
+import '../common/resolution.dart' show Resolution, Target;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../common_elements.dart' show CommonElements;
 import '../deferred_load.dart' show DeferredLoadTask;
 import '../dump_info.dart' show DumpInfoTask;
 import '../elements/elements.dart';
 import '../elements/entities.dart';
@@ skipping 414 matching lines @@
   MirrorsDataImpl _mirrorsData;
   CheckedModeHelpers _checkedModeHelpers;
 
   final SuperMemberData superMemberData = new SuperMemberData();
 
   native.NativeResolutionEnqueuer _nativeResolutionEnqueuer;
   native.NativeCodegenEnqueuer _nativeCodegenEnqueuer;
 
   BackendImpacts impacts;
 
-  /// Backend access to the front-end.
-  final JSFrontendAccess frontend;
-
   Target _target;
 
   Tracer tracer;
 
   static SourceInformationStrategy createSourceInformationStrategy(
       {bool generateSourceMap: false,
       bool useMultiSourceInfo: false,
       bool useNewSourceInfo: false}) {
     if (!generateSourceMap) return const JavaScriptSourceInformationStrategy();
     if (useMultiSourceInfo) {
@@ skipping 20 matching lines @@
       bool useStartupEmitter: false,
       bool useMultiSourceInfo: false,
       bool useNewSourceInfo: false,
       bool useKernel: false})
       : _rti = new _RuntimeTypes(compiler),
         annotations = new Annotations(compiler),
         this.sourceInformationStrategy = createSourceInformationStrategy(
             generateSourceMap: generateSourceMap,
             useMultiSourceInfo: useMultiSourceInfo,
             useNewSourceInfo: useNewSourceInfo),
-        frontend = new JSFrontendAccess(compiler),
         constantCompilerTask = new JavaScriptConstantTask(compiler),
         _nativeDataResolver = new NativeDataResolverImpl(compiler) {
     _target = new JavaScriptBackendTarget(this);
     impacts = new BackendImpacts(compiler.options, commonElements);
     _mirrorsData = new MirrorsDataImpl(
         compiler, compiler.options, commonElements, constants);
     _backendUsageBuilder = new BackendUsageBuilderImpl(commonElements);
     _checkedModeHelpers = new CheckedModeHelpers(commonElements);
     emitter =
         new CodeEmitterTask(compiler, generateSourceMap, useStartupEmitter);
@@ skipping 840 matching lines @@
       bool supportSerialization: true}) {
     return new JavaScriptImpactStrategy(resolution, compiler.dumpInfoTask,
         supportDeferredLoad: supportDeferredLoad,
         supportDumpInfo: supportDumpInfo,
         supportSerialization: supportSerialization);
   }
 
   EnqueueTask makeEnqueuer() => new EnqueueTask(compiler);
 }
 
-class JSFrontendAccess implements Frontend {
-  final Compiler compiler;
-
-  JSFrontendAccess(this.compiler);
-
-  Resolution get resolution => compiler.resolution;
-
-  @override
-  ResolutionImpact getResolutionImpact(Element element) {
-    return resolution.getResolutionImpact(element);
-  }
-}
-
 class JavaScriptImpactStrategy extends ImpactStrategy {
   final Resolution resolution;
   final DumpInfoTask dumpInfoTask;
   final bool supportDeferredLoad;
   final bool supportDumpInfo;
   final bool supportSerialization;
 
   JavaScriptImpactStrategy(this.resolution, this.dumpInfoTask,
       {this.supportDeferredLoad,
       this.supportDumpInfo,
@@ skipping 94 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);
   }
 }