arc: Register ARC content file system

chrome/browser/platform_util_unittest.cc

Index: chrome/browser/platform_util_unittest.cc
diff --git a/chrome/browser/platform_util_unittest.cc b/chrome/browser/platform_util_unittest.cc
index 12480a7dbca5f318f32c189d4a58ebcac3a491d2..b17f4806be0be19ea4900a7ce374ca4fae226c55 100644
--- a/chrome/browser/platform_util_unittest.cc
+++ b/chrome/browser/platform_util_unittest.cc
@@ -22,6 +22,7 @@
 #include "chrome/browser/chrome_content_browser_client.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend.h"
+#include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "content/public/browser/browser_context.h"
@@ -55,7 +56,7 @@ class PlatformUtilTestContentBrowserClient : public ChromeContentBrowserClient {
 
     // New FileSystemBackend that uses our MockSpecialStoragePolicy.
     chromeos::FileSystemBackend* backend = new chromeos::FileSystemBackend(
-        nullptr, nullptr, nullptr, external_mount_points,
+        nullptr, nullptr, nullptr, nullptr, external_mount_points,
         storage::ExternalMountPoints::GetSystemInstance());
     additional_backends->push_back(backend);
   }