Remove ClassWorld.subclassesOf and ClassWorld.subtypesOf.

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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 832 matching lines @@
       }
       return result;
     });
   }
 
   Set<ClassElement> nativeSubclassesOfMixin(ClassElement mixin) {
     ClassWorld classWorld = compiler.world;
     Iterable<MixinApplicationElement> uses = classWorld.mixinUsesOf(mixin);
     Set<ClassElement> result = null;
     for (MixinApplicationElement use in uses) {
-      Iterable<ClassElement> subclasses = classWorld.subclassesOf(use);
+      Iterable<ClassElement> subclasses = classWorld.strictSubclassesOf(use);
       for (ClassElement subclass in subclasses) {
         if (Elements.isNativeOrExtendsNative(subclass)) {
           if (result == null) result = new Set<ClassElement>();
           result.add(subclass);
         }
       }
     }
     return result;
   }
 
@@ skipping 1462 matching lines @@
           }
         });
         // 3) all members, including fields via getter/setters (if resolved)
         cls.forEachClassMember((Member member) {
           if (resolution.hasBeenResolved(member.element)) {
             memberNames.add(member.name);
             reflectableMembers.add(member.element);
           }
         });
         // 4) all overriding members of subclasses/subtypes (should be resolved)
-        if (compiler.world.hasAnySubtype(cls)) {
-          for (ClassElement subcls in compiler.world.subtypesOf(cls)) {
+        if (compiler.world.hasAnyStrictSubtype(cls)) {
+          for (ClassElement subcls in compiler.world.strictSubtypesOf(cls)) {
             subcls.forEachClassMember((Member member) {
               if (memberNames.contains(member.name)) {
                 // TODO(20993): find out why this assertion fails.
                 // assert(invariant(member.element,
                 //    resolution.hasBeenResolved(member.element)));
                 if (resolution.hasBeenResolved(member.element)) {
                   reflectableMembers.add(member.element);
                 }
               }
             });
@@ skipping 657 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }