Fix forget_element_test.

tests/try/poi/forget_element_test.dart

Index: tests/try/poi/forget_element_test.dart
diff --git a/tests/try/poi/forget_element_test.dart b/tests/try/poi/forget_element_test.dart
index ce670e8131fd7a752dcbf6fc2bc3613f112bf0cf..be478554d3c41f3729fe416aea12c1d9d62f3cc5 100644
--- a/tests/try/poi/forget_element_test.dart
+++ b/tests/try/poi/forget_element_test.dart
@@ -260,12 +260,12 @@ class ForgetElementTestCase extends CompilerTestCase {
   }
 
   Iterable codegenSeenClassesIn(LibraryElement library) {
-    return compiler.enqueuer.codegen.seenClasses.where(
+    return compiler.codegenWorld.allInstantiatedClasses.where(
         (e) => e.library == library);
   }
 
   Iterable resolutionSeenClassesIn(LibraryElement library) {
-    return compiler.enqueuer.resolution.seenClasses.where(
+    return compiler.resolverWorld.allInstantiatedClasses.where(
         (e) => e.library == library);
   }
 }