Split World usage into open, inference, and closed world.

pkg/compiler/lib/src/js_emitter/program_builder/collector.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.
 
 part of dart2js.js_emitter.program_builder;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 152 matching lines @@
       outputConstantLists
           .putIfAbsent(constantUnit, () => new List<ConstantValue>())
           .add(constant);
     }
   }
 
   /// Compute all the classes and typedefs that must be emitted.
   void computeNeededDeclarations() {
     // Compute needed typedefs.
     typedefsNeededForReflection = Elements.sortedByPosition(compiler
-        .world.allTypedefs
+        .closedWorld.allTypedefs
         .where(backend.isAccessibleByReflection)
         .toList());
 
     // Compute needed classes.
     Set<ClassElement> instantiatedClasses = compiler
         .codegenWorld.directlyInstantiatedClasses
         .where(computeClassFilter())
         .toSet();
 
     void addClassWithSuperclasses(ClassElement cls) {
@@ skipping 131 matching lines @@
   }
 
   void collect() {
     computeNeededDeclarations();
     computeNeededConstants();
     computeNeededStatics();
     computeNeededStaticNonFinalFields();
     computeNeededLibraries();
   }
 }