Fix typo in set_test.dart, makes analyzer complain.

tests/corelib/set_test.dart

Index: tests/corelib/set_test.dart
diff --git a/tests/corelib/set_test.dart b/tests/corelib/set_test.dart
index 204bf7d5ff4b9b83b71384a6e72008ae3179ad34..3711449d8fb4bbec9d8c153e13e8085986dfe4ca 100644
--- a/tests/corelib/set_test.dart
+++ b/tests/corelib/set_test.dart
@@ -433,11 +433,11 @@ void testCESetFrom(setFrom) {
   Set<CE> set1 = setFrom(ceList);
   Expect.listEquals(ceList, set1.toList()..sort());
 
-  Set<ce> ceSet = ceList.toSet();
+  Set<CE> ceSet = ceList.toSet();
   Set<CE> set2 = setFrom(ceSet);
   Expect.listEquals(ceList, set2.toList()..sort());
 
-  Iterable<ce> ceIter = ceList.where((x) => true);
+  Iterable<CE> ceIter = ceList.where((x) => true);
   Set<CE> set3 = setFrom(ceIter);
   Expect.listEquals(ceList, set3.toList()..sort());