Migrate jumplist update task from FILE thread to base/task_scheduler

chrome/browser/win/jumplist_file_util.cc

 // Copyright (c) 2017 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.
 
 #include "chrome/browser/win/jumplist_file_util.h"
 
 #include <windows.h>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
@@ skipping 91 matching lines @@
   // if it is.
   if (base::IsDirectoryEmpty(path) &&
       !::RemoveDirectory(path.value().c_str())) {
     delete_status = FAIL_REMOVE_RAW_DIRECTORY;
   }
   return delete_status;
 }
 
 void DeleteDirectoryAndLogResults(const base::FilePath& path,
                                   int max_file_deleted) {
-  FolderDeleteResult delete_status = DeleteDirectory(path, max_file_deleted);
-  UMA_HISTOGRAM_ENUMERATION("WinJumplist.DeleteStatusJumpListIconsOld",
-                            delete_status, END);
+  DirectoryStatus dir_status = NON_EXIST;
 
-  DirectoryStatus dir_status = NON_EXIST;
-  if (base::DirectoryExists(path))
+  if (base::DirectoryExists(path)) {
+    FolderDeleteResult delete_status = DeleteDirectory(path, max_file_deleted);
+    UMA_HISTOGRAM_ENUMERATION("WinJumplist.DeleteStatusJumpListIconsOld",
+                              delete_status, FolderDeleteResult::END);
     dir_status = base::IsDirectoryEmpty(path) ? EMPTY : NON_EMPTY;
+  }
 
   UMA_HISTOGRAM_ENUMERATION("WinJumplist.DirectoryStatusJumpListIconsOld",
                             dir_status, DIRECTORY_STATUS_END);
 }