iwyu: Use callback_old.h where appropriate, part 2.

chrome/browser/web_applications/web_app.h

 // Copyright (c) 2011 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_WEB_APPLICATIONS_WEB_APP_H_
 #define CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_
 #pragma once
 
 #include <vector>
 
-#include "base/callback.h"
+#include "base/callback_old.h"
 #include "base/file_path.h"
 #include "build/build_config.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/common/web_apps.h"
 
 class Profile;
 
 namespace web_app {
 
 // Compute a deterministic name based on data in the shortcut_info.
@@ skipping 51 matching lines @@
 bool CheckAndSaveIcon(const FilePath& icon_file, const SkBitmap& image);
 #endif
 
 FilePath GetWebAppDataDirectory(const FilePath& root_dir,
                                 const ShellIntegration::ShortcutInfo& info);
 }  // namespace internals
 
 }  // namespace web_app
 
 #endif  // CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_