housecleaning: remove nonnullableTypes

test/testing.dart

Index: test/testing.dart
diff --git a/test/testing.dart b/test/testing.dart
index f5df4ab02a130a72dd8b3510db2f09ef6645d470..a28328dd4667ab153bdc3ce6fe9be7ed14cdcb8c 100644
--- a/test/testing.dart
+++ b/test/testing.dart
@@ -77,8 +77,7 @@ void testChecker(String name, Map<String, String> testFiles,
     customUrlMappings: const {},
     relaxedCasts: true,
     inferDownwards: StrongModeOptions.inferDownwardsDefault,
-    inferTransitively: StrongModeOptions.inferTransitivelyDefault,
-    nonnullableTypes: StrongModeOptions.NONNULLABLE_TYPES}) {
+    inferTransitively: StrongModeOptions.inferTransitivelyDefault}) {
   test(name, () {
     expect(testFiles.containsKey('/main.dart'), isTrue,
         reason: '`/main.dart` is missing in testFiles');
@@ -102,7 +101,6 @@ void testChecker(String name, Map<String, String> testFiles,
             relaxedCasts: relaxedCasts,
             inferDownwards: inferDownwards,
             inferTransitively: inferTransitively,
-            nonnullableTypes: nonnullableTypes,
             hints: true));
 
     // Run the checker on /main.dart.