Allow Directory.create to create all missing path components.

tests/standalone/io/file_output_stream_test.dart

Index: tests/standalone/io/file_output_stream_test.dart
diff --git a/tests/standalone/io/file_output_stream_test.dart b/tests/standalone/io/file_output_stream_test.dart
index 75e2732a81cd9211a7c5a71a5cdb466ebbaa2bcf..412ea5c04304d7bd0bacc7000dd936deaa591b57 100644
--- a/tests/standalone/io/file_output_stream_test.dart
+++ b/tests/standalone/io/file_output_stream_test.dart
@@ -38,7 +38,7 @@ void testOutputStreamNoPendingWrite() {
   // Create a port for waiting on the final result of this test.
   ReceivePort done = new ReceivePort();
   done.receive((message, replyTo) {
-    tempDirectory.deleteRecursively().then((ignore) => done.close());
+    tempDirectory.delete(recursive: true).then((ignore) => done.close());
   });
 
   new Directory('').createTemp().then((temp) {