Revert of [fsp] Add an initial AsyncFileUtil.

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 bb4c74734daf06f9292cc9a45aa1cabc2ecca4ec..2b6b0d83d3f661092c50a16d371987b05242a52b 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
@@ -42,7 +42,6 @@
       fileapi::ExternalMountPoints::CreateRefCounted());
   chromeos::FileSystemBackend backend(
       NULL,  // drive_delegate
-      NULL,  // file_system_provider_delegate
       storage_policy,
       mount_points.get(),
       fileapi::ExternalMountPoints::GetSystemInstance());
@@ -69,11 +68,11 @@
   scoped_refptr<fileapi::ExternalMountPoints> system_mount_points(
       fileapi::ExternalMountPoints::CreateRefCounted());
 
-  chromeos::FileSystemBackend backend(NULL,  // drive_delegate
-                                      NULL,  // file_system_provider_delegate
-                                      storage_policy,
-                                      mount_points.get(),
-                                      system_mount_points.get());
+  chromeos::FileSystemBackend backend(
+      NULL,  // drive_delegate
+      storage_policy,
+      mount_points.get(),
+      system_mount_points.get());
 
   const size_t initial_root_dirs_size = backend.GetRootDirectories().size();
 
@@ -115,11 +114,11 @@
       fileapi::ExternalMountPoints::CreateRefCounted());
   scoped_refptr<fileapi::ExternalMountPoints> system_mount_points(
       fileapi::ExternalMountPoints::CreateRefCounted());
-  chromeos::FileSystemBackend backend(NULL,  // drive_delegate
-                                      NULL,  // file_system_provider_delegate
-                                      storage_policy,
-                                      mount_points.get(),
-                                      system_mount_points.get());
+  chromeos::FileSystemBackend backend(
+      NULL,  // drive_delegate
+      storage_policy,
+      mount_points.get(),
+      system_mount_points.get());
 
   std::string extension("ddammdhioacbehjngdmkjcjbnfginlla");
 
@@ -215,11 +214,11 @@
       fileapi::ExternalMountPoints::CreateRefCounted());
   scoped_refptr<fileapi::ExternalMountPoints> system_mount_points(
       fileapi::ExternalMountPoints::CreateRefCounted());
-  chromeos::FileSystemBackend backend(NULL,  // drive_delegate
-                                      NULL,  // file_system_provider_delegate
-                                      storage_policy,
-                                      mount_points.get(),
-                                      system_mount_points.get());
+  chromeos::FileSystemBackend backend(
+      NULL,  // drive_delegate
+      storage_policy,
+      mount_points.get(),
+      system_mount_points.get());
 
   const fileapi::FileSystemType type = fileapi::kFileSystemTypeNativeLocal;
   const fileapi::FileSystemMountOption option =