[SyncFS] Delete local file on rename and reorganize completion

chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_backend/drive_backend_util.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 112 matching lines @@
     case FILE_KIND_FILE:
       return "file";
     case FILE_KIND_FOLDER:
       return "folder";
   }
 
   NOTREACHED();
   return "unknown";
 }
 
+bool HasFileAsParent(const FileDetails& details, const std::string& file_id) {
+  for (int i = 0; i < details.parent_folder_ids_size(); ++i) {
+    if (details.parent_folder_ids(i) == file_id)
+      return true;
+  }
+  return false;
+}
+
 }  // namespace drive_backend
 }  // namespace sync_file_system