drive: Stop setting dummy resource ID for "drive" and "other"

chrome/browser/chromeos/drive/sync/entry_update_performer.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/chromeos/drive/sync/entry_update_performer.h"
 
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/job_scheduler.h"
 #include "chrome/browser/chromeos/drive/resource_metadata.h"
@@ skipping 121 matching lines @@
   if (entry->parent_local_id() == util::kDriveTrashDirLocalId) {
     remove_performer_->Remove(entry->local_id(), callback);
     return;
   }
 
   if (entry->metadata_edit_state() == ResourceEntry::CLEAN) {
     callback.Run(FILE_ERROR_OK);
     return;
   }
 
-  std::string parent_resource_id;
-  if (!util::IsSpecialResourceId(parent_entry->resource_id()))
-    parent_resource_id = parent_entry->resource_id();
-
   base::Time last_modified =
       base::Time::FromInternalValue(entry->file_info().last_modified());
   base::Time last_accessed =
       base::Time::FromInternalValue(entry->file_info().last_accessed());
   scheduler_->UpdateResource(
-      entry->resource_id(), parent_resource_id,
+      entry->resource_id(), parent_entry->resource_id(),
       entry->title(), last_modified, last_accessed,
       ClientContext(BACKGROUND),
       base::Bind(&EntryUpdatePerformer::UpdateEntryAfterUpdateResource,
                  weak_ptr_factory_.GetWeakPtr(), callback, entry->local_id()));
 }
 
 void EntryUpdatePerformer::UpdateEntryAfterUpdateResource(
     const FileOperationCallback& callback,
     const std::string& local_id,
     google_apis::GDataErrorCode status,
@@ skipping 14 matching lines @@
 
   base::PostTaskAndReplyWithResult(
       blocking_task_runner_.get(),
       FROM_HERE,
       base::Bind(&FinishUpdate, metadata_, local_id),
       callback);
 }
 
 }  // namespace internal
 }  // namespace drive