Use constexpr TaskTraits constructor in chrome.

chrome/browser/file_select_helper.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/file_select_helper.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 183 matching lines @@
     StartNewEnumeration(path, kFileSelectEnumerationId,
                         render_frame_host_->GetRenderViewHost());
     return;
   }
 
   std::vector<ui::SelectedFileInfo> files;
   files.push_back(file);
 
 #if defined(OS_MACOSX)
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithShutdownBehavior(
-                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&FileSelectHelper::ProcessSelectedFilesMac, this, files));
 #else
   NotifyRenderFrameHostAndEnd(files);
 #endif  // defined(OS_MACOSX)
 }
 
 void FileSelectHelper::MultiFilesSelected(
     const std::vector<base::FilePath>& files,
     void* params) {
   std::vector<ui::SelectedFileInfo> selected_files =
       FilePathListToSelectedFileInfoList(files);
 
   MultiFilesSelectedWithExtraInfo(selected_files, params);
 }
 
 void FileSelectHelper::MultiFilesSelectedWithExtraInfo(
     const std::vector<ui::SelectedFileInfo>& files,
     void* params) {
   if (!files.empty() && IsValidProfile(profile_)) {
     base::FilePath path = files[0].file_path;
     if (dialog_mode_ != FileChooserParams::UploadFolder)
       path = path.DirName();
     profile_->set_last_selected_directory(path);
   }
 #if defined(OS_MACOSX)
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithShutdownBehavior(
-                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&FileSelectHelper::ProcessSelectedFilesMac, this, files));
 #else
   NotifyRenderFrameHostAndEnd(files);
 #endif  // defined(OS_MACOSX)
 }
 
 void FileSelectHelper::FileSelectionCanceled(void* params) {
   NotifyRenderFrameHostAndEnd(std::vector<ui::SelectedFileInfo>());
 }
 
@@ skipping 448 matching lines @@
 
 // static
 base::FilePath FileSelectHelper::GetSanitizedFileName(
     const base::FilePath& suggested_filename) {
   if (suggested_filename.empty())
     return base::FilePath();
   return net::GenerateFileName(
       GURL(), std::string(), std::string(), suggested_filename.AsUTF8Unsafe(),
       std::string(), l10n_util::GetStringUTF8(IDS_DEFAULT_DOWNLOAD_FILENAME));
 }