Further reduce use of Compiler.closedWorld.

tests/compiler/dart2js/world_test.dart

 // Copyright (c) 2015, 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 world_test;
 
 import 'package:expect/expect.dart';
 import 'package:async_helper/async_helper.dart';
 import 'type_test_helper.dart';
 import 'package:compiler/src/common/names.dart';
@@ skipping 31 matching lines @@
         new C();
         new D();
         new E();
         new F();
         new G();
         html.window;
         new html.Worker('');
       }
       """,
       useMockCompiler: false);
-  ClosedWorld closedWorld = env.compiler.closedWorld;
+  ClosedWorld closedWorld = env.closedWorld;
 
   ClassElement Object_ = env.getElement("Object");
   ClassElement A = env.getElement("A");
   ClassElement B = env.getElement("B");
   ClassElement C = env.getElement("C");
   ClassElement D = env.getElement("D");
   ClassElement E = env.getElement("E");
   ClassElement F = env.getElement("F");
   ClassElement G = env.getElement("G");
   ClassElement X = env.getElement("X");
 
   void checkClasses(String property, ClassElement cls,
       Iterable<ClassElement> foundClasses, List<ClassElement> expectedClasses,
       {bool exact: true}) {
     for (ClassElement expectedClass in expectedClasses) {
       Expect.isTrue(
           foundClasses.contains(expectedClass),
           "Expect $expectedClass in '$property' on $cls. "
           "Found:\n ${foundClasses.join('\n ')}\n"
-          "${env.compiler.closedWorld.dump(cls)}");
+          "${closedWorld.dump(cls)}");
     }
     if (exact) {
       Expect.equals(
           expectedClasses.length,
           foundClasses.length,
           "Unexpected classes "
           "${foundClasses.where((c) => !expectedClasses.contains(c))} "
           "in '$property' on $cls.\n"
-          "${env.compiler.closedWorld.dump(cls)}");
+          "${closedWorld.dump(cls)}");
     }
   }
 
   void check(String property, ClassElement cls,
       Iterable<ClassElement> foundClasses, List<ClassElement> expectedClasses,
       {bool exact: true,
       void forEach(ClassElement cls, ForEachFunction f),
       int getCount(ClassElement cls)}) {
     checkClasses(property, cls, foundClasses, expectedClasses, exact: exact);
 
     if (forEach != null) {
       List<ClassElement> visited = <ClassElement>[];
       forEach(cls, (ClassElement c) {
         visited.add(c);
       });
       checkClasses('forEach($property)', cls, visited, expectedClasses,
           exact: exact);
     }
 
     if (getCount != null && exact) {
       int count = getCount(cls);
       Expect.equals(
           expectedClasses.length,
           count,
           "Unexpected class count in '$property' on $cls.\n"
-          "${env.compiler.closedWorld.dump(cls)}");
+          "${closedWorld.dump(cls)}");
     }
   }
 
   void testSubclasses(ClassElement cls, List<ClassElement> expectedClasses,
       {bool exact: true}) {
     check('subclassesOf', cls, closedWorld.subclassesOf(cls), expectedClasses,
         exact: exact);
   }
 
   void testStrictSubclasses(
@@ skipping 114 matching lines @@
         new D2();
         new E3();
         new F1();
         new F2();
         new G2();
         new G3();
         new H4();
       }
       """,
       useMockCompiler: false);
-  ClosedWorld closedWorld = env.compiler.closedWorld;
+  ClosedWorld closedWorld = env.closedWorld;
 
   check(String name, {bool hasStrictSubtype, bool hasOnlySubclasses}) {
     ClassElement cls = env.getElement(name);
     Expect.equals(hasStrictSubtype, closedWorld.hasAnyStrictSubtype(cls),
         "Unexpected hasAnyStrictSubtype property on $cls.");
     Expect.equals(hasOnlySubclasses, closedWorld.hasOnlySubclasses(cls),
         "Unexpected hasOnlySubclasses property on $cls.");
   }
 
   check("Object", hasStrictSubtype: true, hasOnlySubclasses: true);
@@ skipping 56 matching lines @@
       mainSource: r"""
       import 'dart:html' as html;
       main() {
         html.window; // Creates 'Window'.
         new html.Worker(''); // Creates 'Worker'.
         new html.CanvasElement() // Creates CanvasElement
             ..getContext(''); // Creates CanvasRenderingContext2D
       }
       """,
       useMockCompiler: false);
-  ClosedWorld closedWorld = env.compiler.closedWorld;
+  ClosedWorld closedWorld = env.closedWorld;
   LibraryElement dart_html =
       env.compiler.libraryLoader.lookupLibrary(Uris.dart_html);
 
   ClassElement clsEventTarget = dart_html.findExported('EventTarget');
   ClassElement clsWindow = dart_html.findExported('Window');
   ClassElement clsAbstractWorker = dart_html.findExported('AbstractWorker');
   ClassElement clsWorker = dart_html.findExported('Worker');
   ClassElement clsCanvasElement = dart_html.findExported('CanvasElement');
   ClassElement clsCanvasRenderingContext =
       dart_html.findExported('CanvasRenderingContext');
@@ skipping 173 matching lines @@
       isDirectlyInstantiated: false,
       isAbstractlyInstantiated: true,
       isIndirectlyInstantiated: false,
       hasStrictSubtype: false,
       hasOnlySubclasses: true,
       lubOfInstantiatedSubclasses: clsCanvasRenderingContext2D,
       lubOfInstantiatedSubtypes: clsCanvasRenderingContext2D,
       instantiatedSubclassCount: 0,
       instantiatedSubtypeCount: 0);
 }