[fsp] Simplify aborting logic.

chrome/browser/chromeos/file_system_provider/provided_file_system.h

 // Copyright 2014 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_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 152 matching lines @@
       storage::WatcherManager::ChangeType change_type,
       scoped_ptr<ProvidedFileSystemObserver::Changes> changes,
       const std::string& tag,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() override;
 
  private:
   // Aborts an operation executed with a request id equal to
   // |operation_request_id|. The request is removed immediately on the C++ side
   // despite being handled by the providing extension or not.
-  void Abort(int operation_request_id,
-             const storage::AsyncFileUtil::StatusCallback& callback);
+  void Abort(int operation_request_id);
 
   // Called when adding a watcher is completed with either success or en error.
   void OnAddWatcherCompleted(
       const base::FilePath& entry_path,
       bool recursive,
       const Subscriber& subscriber,
       const storage::AsyncFileUtil::StatusCallback& callback,
       base::File::Error result);
 
   // Called when all observers finished handling the change notification. It
@@ skipping 15 matching lines @@
   ObserverList<ProvidedFileSystemObserver> observers_;
 
   base::WeakPtrFactory<ProvidedFileSystem> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ProvidedFileSystem);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_