[fsp] Add an initial AsyncFileUtil.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 79e9ea8a32b41dc1edb090590128b27f26472b00..8ed7b10152f766a5b3a36bf12008158b5514c479 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -45,7 +45,6 @@
 #include "chrome/browser/guestview/guestview.h"
 #include "chrome/browser/guestview/guestview_constants.h"
 #include "chrome/browser/guestview/webview/webview_guest.h"
-#include "chrome/browser/local_discovery/storage/privet_filesystem_backend.h"
 #include "chrome/browser/media/cast_transport_host_filter.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
 #include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h"
@@ -165,6 +164,7 @@
 #elif defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 #include "chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h"
+#include "chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h"
 #include "chrome/browser/chromeos/fileapi/file_system_backend.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ -2551,12 +2551,12 @@ void ChromeContentBrowserClient::GetAdditionalFileSystemBackends(
   fileapi::ExternalMountPoints* external_mount_points =
       content::BrowserContext::GetMountPoints(browser_context);
   DCHECK(external_mount_points);
-  chromeos::FileSystemBackend* backend =
-      new chromeos::FileSystemBackend(
-          new drive::FileSystemBackendDelegate,
-          browser_context->GetSpecialStoragePolicy(),
-          external_mount_points,
-          fileapi::ExternalMountPoints::GetSystemInstance());
+  chromeos::FileSystemBackend* backend = new chromeos::FileSystemBackend(
+      new drive::FileSystemBackendDelegate,
+      new chromeos::file_system_provider::BackendDelegate,
+      browser_context->GetSpecialStoragePolicy(),
+      external_mount_points,
+      fileapi::ExternalMountPoints::GetSystemInstance());
   backend->AddSystemMountPoints();
   DCHECK(backend->CanHandleType(fileapi::kFileSystemTypeExternal));
   additional_backends->push_back(backend);