Files.app: remove typo'd line in file_system_metadata_provider_unittest

Stumbled upon what seems to be a typo here. Since the file referenced in
the typo'd line is included again later, we can safely remove the line.

BUG=None
TEST=None

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If30006512aaf4b19a7d27484b6e8e3ad0553208d
Reviewed-on: https://chromium-review.googlesource.com/817457Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523313}

ui/file_manager/file_manager/foreground/js/metadata/file_system_metadata_provider_unittest.html

@@ -8,7 +8,6 @@
 <script src="../../../../../webui/resources/js/cr/event_target.js"></script>
 <script src="metadata_cache_set.js"></script>
 <script src="metadata_provider.js"></script>
-<scrpit src="metadata_request.js"></script>
 
 <!-- Others -->
 <script src="../../../../../webui/resources/js/assert.js"></script>