mojo: Fix leveldb unittests by making fs::Directories cloneable.

components/filesystem/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 import("//testing/test.gni")
 
 source_set("lib") {
   sources = [
     "directory_impl.cc",
     "directory_impl.h",
     "file_impl.cc",
     "file_impl.h",
     "file_system_impl.cc",
     "file_system_impl.h",
     "lock_table.cc",
     "lock_table.h",
+    "shared_temp_dir.cc",
+    "shared_temp_dir.h",
     "util.cc",
     "util.h",
   ]
 
   deps = [
     "//base",
     "//components/filesystem/public/interfaces",
     "//mojo/common",
     "//mojo/common:common_base",
     "//mojo/platform_handle",
@@ skipping 55 matching lines @@
     ":test_manifest",
     ":filesystem",
   ]
 }
 
 mojo_application_manifest("test_manifest") {
   type = "exe"
   application_name = "filesystem_service_unittests"
   source = "test_manifest.json"
 }