Allow Directory.create to create all missing path components.

tests/standalone/io/dart_std_io_pipe_test.dart

Index: tests/standalone/io/dart_std_io_pipe_test.dart
diff --git a/tests/standalone/io/dart_std_io_pipe_test.dart b/tests/standalone/io/dart_std_io_pipe_test.dart
index 5264a723d84c15e3042d5287600c1bb5071bf5ae..aa9e89d4b63a02bf75149353b6c226684470a732 100644
--- a/tests/standalone/io/dart_std_io_pipe_test.dart
+++ b/tests/standalone/io/dart_std_io_pipe_test.dart
@@ -65,14 +65,14 @@ void test(String shellScript, String dartScript, String type) {
       }
 
       // Cleanup test directory.
-      dir.deleteRecursivelySync();
+      dir.deleteSync(recursive: true);
     };
     // Drain out and err streams so they close.
     process.stdout.onData = process.stdout.read;
     process.stderr.onData = process.stderr.read;
   });
   future.handleException((ProcessException error) {
-    dir.deleteRecursivelySync();
+    dir.deleteSync(recursive: true);
     Expect.fail(error.toString());
   });
 }