Remove BackendClasses and JavaScriptBackendClasses.

pkg/compiler/lib/src/world.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.world;
 
 import 'closure.dart' show ClosureClassElement, SynthesizedCallMethodElementX;
-import 'common/backend_api.dart' show BackendClasses;
 import 'common.dart';
 import 'constants/constant_system.dart';
 import 'common_elements.dart' show CommonElements;
 import 'elements/entities.dart';
 import 'elements/elements.dart'
     show
         ClassElement,
         Element,
         FunctionElement,
         MemberElement,
@@ skipping 17 matching lines @@
 
 /// The [ClosedWorld] represents the information known about a program when
 /// compiling with closed-world semantics.
 ///
 /// Given the entrypoint of an application, we can track what's reachable from
 /// it, what functions are called, what classes are allocated, which native
 /// JavaScript types are touched, what language features are used, and so on.
 /// This precise knowledge about what's live in the program is later used in
 /// optimizations and other compiler decisions during code generation.
 abstract class ClosedWorld implements World {
-  /// Access to core classes used by the backend.
-  BackendClasses get backendClasses;
-
   NativeData get nativeData;
 
   InterceptorData get interceptorData;
 
   CommonElements get commonElements;
 
   CommonMasks get commonMasks;
 
   ConstantSystem get constantSystem;
 
@@ skipping 323 matching lines @@
   /// The class and all subclasses (transitively) are included.
   SUBCLASS,
 
   /// The class and all classes that implement or subclass it (transitively)
   /// are included.
   SUBTYPE,
 }
 
 abstract class ClosedWorldBase implements ClosedWorld, ClosedWorldRefiner {
   final JavaScriptBackend _backend;
-  BackendClasses get backendClasses => _backend.backendClasses;
   InterceptorData get interceptorData => _backend.interceptorData;
   FunctionSet _allFunctions;
 
   final Iterable<TypedefElement> _allTypedefs;
 
   final Map<ClassEntity, Set<ClassEntity>> _mixinUses;
   Map<ClassEntity, List<ClassEntity>> _liveMixinUses;
 
   final Map<ClassEntity, Set<ClassEntity>> _typesImplementedBySubclasses;
 
@@ skipping 809 matching lines @@
       return getMightBePassedToApply(element.expression);
     }
     return functionsThatMightBePassedToApply.contains(element);
   }
 
   @override
   bool getCurrentlyKnownMightBePassedToApply(Element element) {
     return getMightBePassedToApply(element);
   }
 }