Make closedWorld a property of ClosedWorldRefiner.

pkg/compiler/lib/src/compiler.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.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 673 matching lines @@
             // compiler from analyzing all the code.
             // TODO(johnniwinther): Reenable this when the reporting is more
             // precise.
             //reportUnusedCode();
           }
           return;
         }
         assert(mainFunction != null);
 
         ClosedWorldRefiner closedWorldRefiner = closeResolution();
-        // TODO(johnniwinther): Make [ClosedWorld] a property of
-        // [ClosedWorldRefiner].
-        ClosedWorld closedWorld = resolverWorld.closedWorldForTesting;
+        ClosedWorld closedWorld = closedWorldRefiner.closedWorld;
 
         reporter.log('Inferring types...');
         globalInference.runGlobalTypeInference(
             mainFunction, closedWorld, closedWorldRefiner);
 
         if (stopAfterTypeInference) return;
 
         backend.onTypeInferenceComplete();
 
         reporter.log('Compiling...');
         phase = PHASE_COMPILING;
 
+        codegenWorld.open(closedWorld);
         enqueuer.codegen.applyImpact(backend.onCodegenStart(closedWorld));
         if (compileAll) {
           libraryLoader.libraries.forEach((LibraryElement library) {
             enqueuer.codegen.applyImpact(computeImpactForLibrary(library));
           });
         }
         processQueue(enqueuer.codegen, mainFunction,
             onProgress: showCodegenProgress);
         enqueuer.codegen.logSummary(reporter.log);
 
@@ skipping 1493 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }