Further reduce use of Compiler.closedWorld.

tests/compiler/dart2js/type_inference8_test.dart

Index: tests/compiler/dart2js/type_inference8_test.dart
diff --git a/tests/compiler/dart2js/type_inference8_test.dart b/tests/compiler/dart2js/type_inference8_test.dart
index fb4717c1ad2e695867a4947195c6077abea9f4aa..bc629d844eb3c27a1df7c3b09a539f475216c2c1 100644
--- a/tests/compiler/dart2js/type_inference8_test.dart
+++ b/tests/compiler/dart2js/type_inference8_test.dart
@@ -34,8 +34,8 @@ Future runTest1() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST1, uri);
   return compiler.run(uri).then((_) {
-    var commonMasks = compiler.closedWorld.commonMasks;
     var typesInferrer = compiler.globalInference.typesInferrerInternal;
+    var commonMasks = typesInferrer.closedWorld.commonMasks;
     var element = findElement(compiler, "foo");
     var mask = typesInferrer.getReturnTypeOfElement(element);
     var falseType =
@@ -77,8 +77,8 @@ Future runTest2() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST2, uri);
   return compiler.run(uri).then((_) {
-    var commonMasks = compiler.closedWorld.commonMasks;
     var typesInferrer = compiler.globalInference.typesInferrerInternal;
+    var commonMasks = typesInferrer.closedWorld.commonMasks;
     var element = findElement(compiler, "foo");
     var mask = typesInferrer.getReturnTypeOfElement(element);
     // Can't infer value for foo's return type, it could be either true or false