- Inline iterator calls made for a "for in".

tests/compiler/dart2js/field_type_simple_inferer_test.dart

Index: tests/compiler/dart2js/field_type_simple_inferer_test.dart
===================================================================
--- tests/compiler/dart2js/field_type_simple_inferer_test.dart	(revision 23246)
+++ tests/compiler/dart2js/field_type_simple_inferer_test.dart	(working copy)
@@ -334,11 +334,13 @@
 const String TEST_20 = r"""
   class A {
     var f;
-    A(x) {
-      for (var i in this) {
+    A() {
+      for (f in this) {
       }
-      f = 42;
     }
+    get iterator => this;
+    get current => 42;
+    bool moveNext() => false;
   }
   main() {
     new A();
@@ -508,7 +510,7 @@
   runTest(TEST_19, {'f1': (inferrer) => inferrer.intType,
                     'f2': (inferrer) => inferrer.stringType,
                     'f3': (inferrer) => inferrer.dynamicType});
-  runTest(TEST_20, {'f': (inferrer) => inferrer.intType});
+  runTest(TEST_20, {'f': (inferrer) => inferrer.intType.nullable()});
   runTest(TEST_21, {'f': (inferrer) => inferrer.intType.nullable()});
 
   runTest(TEST_22, {'f1': (inferrer) => inferrer.intType,