chromeos: Destruct DriveResourceMetadata on the blocking pool

chrome/browser/chromeos/drive/drive_system_service.h

 // Copyright (c) 2012 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_DRIVE_DRIVE_SYSTEM_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_SYSTEM_SERVICE_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/drive/drive_file_error.h"
+#include "chrome/browser/chromeos/drive/drive_file_system_util.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 #include "sync/notifier/invalidation_handler.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace google_apis {
 class DriveServiceInterface;
@@ skipping 60 matching lines @@
   // Reloads and remounts the file system.
   void ReloadAndRemountFileSystem();
 
   // syncer::InvalidationHandler implementation.
   virtual void OnInvalidatorStateChange(
       syncer::InvalidatorState state) OVERRIDE;
   virtual void OnIncomingInvalidation(
       const syncer::ObjectIdInvalidationMap& invalidation_map) OVERRIDE;
 
  private:
-  // Used to destroy DriveCache with scoped_ptr.
-  struct DriveCacheDeleter {
-   public:
-    void operator()(DriveCache* cache) const;
-  };
-
   // Returns true if Drive is enabled.
   // Must be called on UI thread.
   bool IsDriveEnabled();
 
   // Registers remote file system proxy for drive mount point.
   void AddDriveMountPoint();
   // Unregisters drive mount point from File API.
   void RemoveDriveMountPoint();
 
   // Adds back the drive mount point. Used to implement ClearCache().
@@ skipping 13 matching lines @@
 
   Profile* profile_;
   // True if Drive is disabled due to initialization errors.
   bool drive_disabled_;
 
   // True once this is registered to listen to the Drive updates.
   bool push_notification_registered_;
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
   scoped_ptr<EventLogger> event_logger_;
-  scoped_ptr<DriveCache, DriveCacheDeleter> cache_;
+  scoped_ptr<DriveCache, util::DestroyHelper> cache_;
   scoped_ptr<google_apis::DriveServiceInterface> drive_service_;
   scoped_ptr<google_apis::DriveUploader> uploader_;
   scoped_ptr<DriveWebAppsRegistry> webapps_registry_;
   scoped_ptr<DriveFileSystemInterface> file_system_;
   scoped_ptr<FileWriteHelper> file_write_helper_;
   scoped_ptr<DriveDownloadHandler> download_handler_;
   scoped_ptr<DriveSyncClient> sync_client_;
   scoped_ptr<DrivePrefetcher> prefetcher_;
   scoped_ptr<StaleCacheFilesRemover> stale_cache_files_remover_;
   scoped_refptr<DriveFileSystemProxy> file_system_proxy_;
@@ skipping 50 matching lines @@
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 
   FactoryCallback factory_for_test_;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_SYSTEM_SERVICE_H_