Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/file_manager/open_with_browser.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/file_manager/open_with_browser.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 152 matching lines @@
       // drive's web interface. Otherwise (e.g. MTP, FSP), the file is just
       // downloaded in a browser tab.
       const GURL url =
           chromeos::FileSystemURLToExternalFileURL(file_system_url);
       DCHECK(!url.is_empty());
       OpenNewTab(profile, url);
     } else {
       // The file is local (downloaded from an attachment or otherwise copied).
       // Parse the file to extract the Docs url and open this url.
       base::PostTaskWithTraitsAndReplyWithResult(
-          FROM_HERE, base::TaskTraits().MayBlock(),
+          FROM_HERE, {base::MayBlock()},
           base::Bind(&ReadUrlFromGDocAsync, file_path),
           base::Bind(&OpenNewTab, profile));
     }
     return true;
   }
 
   // Failed to open the file of unknown type.
   LOG(WARNING) << "Unknown file type: " << file_path.value();
   return false;
 }
 
 // If a bundled plugin is enabled, we should open pdf/swf files in a tab.
 bool ShouldBeOpenedWithPlugin(
     Profile* profile,
     const base::FilePath::StringType& file_extension) {
   DCHECK(profile);
 
   const base::FilePath file_path =
       base::FilePath::FromUTF8Unsafe("dummy").AddExtension(file_extension);
   if (file_path.MatchesExtension(kPdfExtension))
     return IsPdfPluginEnabled(profile);
   if (file_path.MatchesExtension(kSwfExtension))
     return IsFlashPluginEnabled(profile);
   return false;
 }
 
 }  // namespace util
 }  // namespace file_manager