Use constexpr TaskTraits constructor in net.

net/disk_cache/blockfile/file_ios.cc

 // Copyright 2014 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 "net/disk_cache/blockfile/file.h"
 
 #include <limits.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 104 matching lines @@
 
 // ---------------------------------------------------------------------------
 
 void FileInFlightIO::PostRead(disk_cache::File *file, void* buf, size_t buf_len,
                           size_t offset, disk_cache::FileIOCallback *callback) {
   scoped_refptr<FileBackgroundIO> operation(
       new FileBackgroundIO(file, buf, buf_len, offset, callback, this));
   file->AddRef();  // Balanced on OnOperationComplete()
 
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .MayBlock(),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&FileBackgroundIO::Read, operation.get()));
   OnOperationPosted(operation.get());
 }
 
 void FileInFlightIO::PostWrite(disk_cache::File* file, const void* buf,
                            size_t buf_len, size_t offset,
                            disk_cache::FileIOCallback* callback) {
   scoped_refptr<FileBackgroundIO> operation(
       new FileBackgroundIO(file, buf, buf_len, offset, callback, this));
   file->AddRef();  // Balanced on OnOperationComplete()
 
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .MayBlock(),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&FileBackgroundIO::Write, operation.get()));
   OnOperationPosted(operation.get());
 }
 
 // Runs on the IO thread.
 void FileInFlightIO::OnOperationComplete(disk_cache::BackgroundIO* operation,
                                          bool cancel) {
   FileBackgroundIO* op = static_cast<FileBackgroundIO*>(operation);
 
   disk_cache::FileIOCallback* callback = op->callback();
@@ skipping 147 matching lines @@
     return false;
 
   GetFileInFlightIO()->PostWrite(this, buffer, buffer_len, offset, callback);
 
   if (completed)
     *completed = false;
   return true;
 }
 
 }  // namespace disk_cache