Reland "Revert 156830 - drive: Stop exposing operation_registry() from DriveServiceInterface"

chrome/browser/chromeos/gdata/drive_protocol_handler.cc

Index: chrome/browser/chromeos/gdata/drive_protocol_handler.cc
diff --git a/chrome/browser/chromeos/gdata/drive_protocol_handler.cc b/chrome/browser/chromeos/gdata/drive_protocol_handler.cc
index 862ee9b6ced408976ec7a1ac363095916e1d5a12..0fdaf5e30da5c21b6c0fcb6126f5770cc294b6a2 100644
--- a/chrome/browser/chromeos/gdata/drive_protocol_handler.cc
+++ b/chrome/browser/chromeos/gdata/drive_protocol_handler.cc
@@ -120,8 +120,7 @@ void GetFileSystemOnUIThread(DriveFileSystemInterface** file_system) {
 void CancelDriveDownloadOnUIThread(const FilePath& drive_file_path) {
   DriveSystemService* system_service = GetSystemService();
   if (system_service)
-    system_service->drive_service()->operation_registry()->CancelForFilePath(
-        drive_file_path);
+    system_service->drive_service()->CancelForFilePath(drive_file_path);
 }
 
 // DriveURLRequesetJob is the gateway between network-level drive://...