arc: Register ARC content file system

chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc

Index: chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc b/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
index ca8f55a15c74001f3ab78e52c435368adb7dd9c7..fee54ff1a015f7a5a64e28a306d79e442271d784 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
@@ -43,8 +43,8 @@ TEST(ChromeOSFileSystemBackendTest, DefaultMountPoints) {
       NULL,  // drive_delegate

[hidehiko, 2016/10/25 16:55:44]

(optional) nullptr is preferred nowadays?

[hashimoto, 2016/10/26 05:23:12]

Done.

       NULL,  // file_system_provider_delegate
       NULL,  // mtp_delegate
-      mount_points.get(),
-      storage::ExternalMountPoints::GetSystemInstance());
+      NULL,  // arc_content_delegate
+      mount_points.get(), storage::ExternalMountPoints::GetSystemInstance());
   backend.AddSystemMountPoints();
   std::vector<base::FilePath> root_dirs = backend.GetRootDirectories();
   std::set<base::FilePath> root_dirs_set(root_dirs.begin(), root_dirs.end());
@@ -69,6 +69,7 @@ TEST(ChromeOSFileSystemBackendTest, GetRootDirectories) {
   chromeos::FileSystemBackend backend(NULL,  // drive_delegate
                                       NULL,  // file_system_provider_delegate
                                       NULL,  // mtp_delegate
+                                      NULL,  // arc_content_delegate
                                       mount_points.get(),
                                       system_mount_points.get());
 
@@ -113,6 +114,7 @@ TEST(ChromeOSFileSystemBackendTest, AccessPermissions) {
   chromeos::FileSystemBackend backend(NULL,  // drive_delegate
                                       NULL,  // file_system_provider_delegate
                                       NULL,  // mtp_delegate
+                                      NULL,  // arc_content_delegate
                                       mount_points.get(),
                                       system_mount_points.get());
 
@@ -181,6 +183,7 @@ TEST(ChromeOSFileSystemBackendTest, GetVirtualPathConflictWithSystemPoints) {
   chromeos::FileSystemBackend backend(NULL,  // drive_delegate
                                       NULL,  // file_system_provider_delegate
                                       NULL,  // mtp_delegate
+                                      NULL,  // arc_content_delegate
                                       mount_points.get(),
                                       system_mount_points.get());