Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.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/extensions/file_manager/private_api_file_system.h"
 
 #include <sys/statvfs.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 479 matching lines @@
         storage_monitor->media_transfer_protocol_manager();
     manager->GetStorageInfoFromDevice(
         storage_name,
         base::Bind(
             &FileManagerPrivateGetSizeStatsFunction::OnGetMtpAvailableSpace,
             this));
   } else {
     uint64_t* total_size = new uint64_t(0);
     uint64_t* remaining_size = new uint64_t(0);
     base::PostTaskWithTraitsAndReply(
-        FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                       base::TaskPriority::USER_VISIBLE),
+        FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
         base::Bind(&GetSizeStatsAsync, volume->mount_path(), total_size,
                    remaining_size),
         base::Bind(&FileManagerPrivateGetSizeStatsFunction::OnGetSizeStats,
                    this, base::Owned(total_size), base::Owned(remaining_size)));
   }
   return true;
 }
 
 void FileManagerPrivateGetSizeStatsFunction::OnGetDriveAvailableSpace(
     drive::FileError error,
@@ skipping 54 matching lines @@
     return false;
 
   // No explicit limit on the length of Drive file names.
   if (file_system_url.type() == storage::kFileSystemTypeDrive) {
     SetResult(base::MakeUnique<base::Value>(true));
     SendResponse(true);
     return true;
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_BLOCKING),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_BLOCKING},
       base::Bind(&GetFileNameMaxLengthAsync,
                  file_system_url.path().AsUTF8Unsafe()),
       base::Bind(&FileManagerPrivateInternalValidatePathNameLengthFunction::
                      OnFilePathLimitRetrieved,
                  this, params->name.size()));
   return true;
 }
 
 void FileManagerPrivateInternalValidatePathNameLengthFunction::
     OnFilePathLimitRetrieved(size_t current_length, size_t max_length) {
@@ skipping 445 matching lines @@
   }
 
   const base::FilePath root_path = file_manager::util::GetLocalPathFromURL(
       render_frame_host(), GetProfile(), GURL(params->url));
   if (root_path.empty()) {
     SetError("Failed to get a local path from the entry's url.");
     return false;
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&base::ComputeDirectorySize, root_path),
       base::Bind(&FileManagerPrivateInternalGetDirectorySizeFunction::
                      OnDirectorySizeRetrieved,
                  this));
   return true;
 }
 
 void FileManagerPrivateInternalGetDirectorySizeFunction::
     OnDirectorySizeRetrieved(int64_t size) {
   SetResult(base::MakeUnique<base::Value>(static_cast<double>(size)));
   SendResponse(true);
 }
 
 }  // namespace extensions