[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 <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 100 matching lines @@
   base::FilePath temp_file_path;
   if (!file_util::CreateTemporaryFile(&temp_file_path))
     return webkit_blob::ScopedFile();
 
   return webkit_blob::ScopedFile(
       temp_file_path,
       webkit_blob::ScopedFile::DELETE_ON_SCOPE_OUT,
       base::MessageLoopProxy::current().get());
 }
 
+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