[Extensions] Convert some ChromeSyncExtensionFunctions

chrome/browser/chromeos/extensions/file_manager/private_api_tasks.h

 // Copyright 2013 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.
 //
 // This file provides task related API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_TASKS_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_TASKS_H_
 
 #include <memory>
@@ skipping 63 matching lines @@
   std::unique_ptr<app_file_handler_util::IsDirectoryCollector>
       is_directory_collector_;
   std::unique_ptr<app_file_handler_util::MimeTypeCollector>
       mime_type_collector_;
   std::vector<GURL> urls_;
   std::vector<base::FilePath> local_paths_;
 };
 
 // Implements the chrome.fileManagerPrivateInternal.setDefaultTask method.
 class FileManagerPrivateInternalSetDefaultTaskFunction
-    : public ChromeSyncExtensionFunction {
+    : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileManagerPrivateInternal.setDefaultTask",
                              FILEMANAGERPRIVATEINTERNAL_SETDEFAULTTASK)
 
  protected:
   ~FileManagerPrivateInternalSetDefaultTaskFunction() override {}
 
-  // SyncExtensionFunction overrides.
-  bool RunSync() override;
+  // ExtensionFunction:
+  ResponseAction Run() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_TASKS_H_