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

tests/compiler/dart2js/trust_type_annotations_test.dart

Index: tests/compiler/dart2js/trust_type_annotations_test.dart
diff --git a/tests/compiler/dart2js/trust_type_annotations_test.dart b/tests/compiler/dart2js/trust_type_annotations_test.dart
index a90d7e50bd4df6d8c4ff64f609edbb3d1d994775..6b27867d3d9a59da03304663bfecb168aff1c09e 100644
--- a/tests/compiler/dart2js/trust_type_annotations_test.dart
+++ b/tests/compiler/dart2js/trust_type_annotations_test.dart
@@ -58,16 +58,16 @@ void main() {
       var element = classA.lookupMember(name);
       var mask = typesInferrer.getReturnTypeOfElement(element);
       Expect.isTrue(type.containsMask(
-          typesInferrer.getReturnTypeOfElement(element), compiler.world));
+          typesInferrer.getReturnTypeOfElement(element), compiler.closedWorld));
     }
     checkType(String name, type) {
       var element = classA.lookupMember(name);
       Expect.isTrue(type.containsMask(
-                typesInferrer.getTypeOfElement(element), compiler.world));
+                typesInferrer.getTypeOfElement(element), compiler.closedWorld));
     }
 
     var intMask = new TypeMask.subtype(
-        compiler.coreClasses.intClass, compiler.world);
+        compiler.coreClasses.intClass, compiler.closedWorld);
 
     checkReturn('foo', intMask);
     checkReturn('faa', intMask);