Drive: Removes unused cache files after the initial feed fetch.

chrome/browser/chromeos/gdata/drive_system_service.h

Index: chrome/browser/chromeos/gdata/drive_system_service.h
diff --git a/chrome/browser/chromeos/gdata/drive_system_service.h b/chrome/browser/chromeos/gdata/drive_system_service.h
index 3f8814f76695bd554b25ad15c62123b8bf7b02ba..eca3f678cfacfbf66279ddbcb0dcef2f4a81f326 100644
--- a/chrome/browser/chromeos/gdata/drive_system_service.h
+++ b/chrome/browser/chromeos/gdata/drive_system_service.h
@@ -27,6 +27,7 @@ class FileWriteHelper;
 class GDataDownloadObserver;
 class GDataSyncClient;
 class GDataUploader;
+class StaleCacheFilesRemover;
 
 // DriveSystemService runs the Drive system, including the Drive file system
 // implementation for the file manager, and some other sub systems.
@@ -82,6 +83,7 @@ class DriveSystemService : public ProfileKeyedService  {
   scoped_ptr<FileWriteHelper> file_write_helper_;
   scoped_ptr<GDataDownloadObserver> download_observer_;
   scoped_ptr<GDataSyncClient> sync_client_;
+  scoped_ptr<StaleCacheFilesRemover> stale_cache_files_remover_;
   base::WeakPtrFactory<DriveSystemService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveSystemService);