Various logical fixes for jumplist

chrome/browser/win/jumplist_file_util.h

 // 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.
 
 #ifndef CHROME_BROWSER_WIN_JUMPLIST_FILE_UTIL_H_
 #define CHROME_BROWSER_WIN_JUMPLIST_FILE_UTIL_H_
 
 #include "base/files/file_path.h"
 
 // Maximum number of icon files allowed to delete per jumplist update.
-const int kFileDeleteLimit = 60;
+const int kFileDeleteLimit = 30;
 
 // Folder delete status enumeration, used in Delete* methods below.
 // This is used for UMA. Do not delete entries, and keep in sync with
 // histograms.xml.
 enum FolderDeleteResult {
   SUCCEED = 0,
   // File name's length exceeds MAX_PATH. This shouldn't happen.
   FAIL_INVALID_FILE_PATH,
   // JumpListIcons{,Old} directories are read-only. This may heppen.
   FAIL_READ_ONLY_DIRECTORY,
@@ skipping 54 matching lines @@
 
 // Deletes the directory at |path| and records the result to UMA.
 void DeleteDirectoryAndLogResults(const base::FilePath& path,
                                   int max_file_deleted);
 
 // Deletes the content in the directory at |path| and records the result to UMA.
 void DeleteDirectoryContentAndLogResults(const base::FilePath& path,
                                          int max_file_deleted);
 
 #endif  // CHROME_BROWSER_WIN_JUMPLIST_FILE_UTIL_H_