Use constexpr TaskTraits constructor in media.

media/filters/ffmpeg_demuxer.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 "media/filters/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <memory>
 #include <set>
 #include <utility>
@@ skipping 837 matching lines @@
     DataSource* data_source,
     const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
     const MediaTracksUpdatedCB& media_tracks_updated_cb,
     MediaLog* media_log)
     : host_(NULL),
       task_runner_(task_runner),
       // FFmpeg has no asynchronous API, so we use base::WaitableEvents inside
       // the BlockingUrlProtocol to handle hops to the render thread for network
       // reads and seeks.
       blocking_task_runner_(base::CreateSequencedTaskRunnerWithTraits(
-          base::TaskTraits().MayBlock().WithBaseSyncPrimitives().WithPriority(
-              base::TaskPriority::USER_BLOCKING))),
+          {base::MayBlock(), base::WithBaseSyncPrimitives(),
+           base::TaskPriority::USER_BLOCKING})),
       stopped_(false),
       pending_read_(false),
       data_source_(data_source),
       media_log_(media_log),
       bitrate_(0),
       start_time_(kNoTimestamp),
       text_enabled_(false),
       duration_known_(false),
       encrypted_media_init_data_cb_(encrypted_media_init_data_cb),
       media_tracks_updated_cb_(media_tracks_updated_cb),
@@ skipping 1011 matching lines @@
 
 void FFmpegDemuxer::SetLiveness(DemuxerStream::Liveness liveness) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   for (const auto& stream : streams_) {
     if (stream)
       stream->SetLiveness(liveness);
   }
 }
 
 }  // namespace media