Convert utility process zip creator IPC to mojo: part 2

chrome/browser/chromeos/file_manager/zip_file_creator.cc

 // Copyright (c) 2012 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/file_manager/zip_file_creator.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 57 matching lines @@
   utility_process_mojo_client_->Start();
 
   utility_process_mojo_client_->service()->CreateZipFile(
       src_dir_, src_relative_paths_, std::move(file),
       base::Bind(&ZipFileCreator::ReportDone, this));
 }
 
 void ZipFileCreator::ReportDone(bool success) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
-  // The current user of this class holds no reference to |this| so resetting
-  // the |utility_process_mojo_client_| here could release the last reference
-  // and delete |this|. So save |callback_| before resetting the client.
-  auto callback = base::ResetAndReturn(&callback_);
   utility_process_mojo_client_.reset();
-  callback.Run(success);
+  base::ResetAndReturn(&callback_).Run(success);
 }
 
 }  // namespace file_manager