Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/camera_detector.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/chromeos/camera_detector.h"
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
@@ skipping 30 matching lines @@
 
 // static
 void CameraDetector::StartPresenceCheck(const base::Closure& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   if (presence_check_in_progress_)
     return;
   DVLOG(1) << "Starting camera presence check";
   presence_check_in_progress_ = true;
   base::PostTaskAndReplyWithResult(
       base::CreateTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})
           .get(),
       FROM_HERE, base::Bind(&CameraDetector::CheckPresence),
       base::Bind(&CameraDetector::OnPresenceCheckDone, callback));
 }
 
 // static
 void CameraDetector::OnPresenceCheckDone(const base::Closure& callback,
                                          bool present) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   camera_presence_ = present ? kCameraPresent : kCameraAbsent;
@@ skipping 18 matching lines @@
           base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
       if (find(caps.begin(), caps.end(), kV4LCaptureCapability) != caps.end()) {
         return true;
       }
     }
   }
   return false;
 }
 
 }  // namespace chromeos