Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/api/messaging/native_message_process_host.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/extensions/api/messaging/native_message_process_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 53 matching lines @@
 
 NativeMessageProcessHost::~NativeMessageProcessHost() {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   if (process_.IsValid()) {
     // Kill the host process if necessary to make sure we don't leave zombies.
     // On OSX base::EnsureProcessTerminated() may block, so we have to post a
     // task on the blocking pool.
 #if defined(OS_MACOSX)
     base::PostTaskWithTraits(
-        FROM_HERE,
-        base::TaskTraits().MayBlock().WithPriority(
-            base::TaskPriority::BACKGROUND),
+        FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
         base::BindOnce(&base::EnsureProcessTerminated, Passed(&process_)));
 #else
     base::EnsureProcessTerminated(std::move(process_));
 #endif
   }
 }
 
 // static
 std::unique_ptr<NativeMessageHost> NativeMessageHost::Create(
     gfx::NativeView native_view,
@@ skipping 53 matching lines @@
       break;
   }
 
   process_ = std::move(process);
 #if defined(OS_POSIX)
   // This object is not the owner of the file so it should not keep an fd.
   read_file_ = read_file.GetPlatformFile();
 #endif
 
   scoped_refptr<base::TaskRunner> task_runner(base::CreateTaskRunnerWithTraits(
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::USER_VISIBLE)
-          .WithShutdownBehavior(base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN)));
+      {base::MayBlock(), base::TaskPriority::USER_VISIBLE,
+       base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN}));
 
   read_stream_.reset(new net::FileStream(std::move(read_file), task_runner));
   write_stream_.reset(new net::FileStream(std::move(write_file), task_runner));
 
   WaitRead();
   DoWrite();
 }
 
 void NativeMessageProcessHost::OnMessage(const std::string& json) {
   DCHECK(task_runner_->BelongsToCurrentThread());
@@ skipping 189 matching lines @@
 
   if (!closed_) {
     closed_ = true;
     read_stream_.reset();
     write_stream_.reset();
     client_->CloseChannel(error_message);
   }
 }
 
 }  // namespace extensions