Use constexpr TaskTraits constructor in components.

components/nacl/browser/nacl_browser.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 "components/nacl/browser/nacl_browser.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/files/file_proxy.h"
@@ skipping 359 matching lines @@
   if (IsOk() && validation_cache_state_ == NaClResourceUninitialized) {
     if (ValidationCacheIsEnabled()) {
       validation_cache_state_ = NaClResourceRequested;
 
       // Structure for carrying data between the callbacks.
       std::string* data = new std::string();
       // We can get away not giving this a sequence ID because this is the first
       // task and further file access will not occur until after we get a
       // response.
       base::PostTaskWithTraitsAndReply(
-          FROM_HERE,
-          base::TaskTraits().MayBlock().WithPriority(
-              base::TaskPriority::BACKGROUND),
+          FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
           base::Bind(ReadCache, validation_cache_file_path_, data),
           base::Bind(&NaClBrowser::OnValidationCacheLoaded,
                      base::Unretained(this), base::Owned(data)));
     } else {
       RunWithoutValidationCache();
     }
   }
 }
 
 void NaClBrowser::OnValidationCacheLoaded(const std::string *data) {
@@ skipping 217 matching lines @@
 bool NaClBrowser::IsThrottled() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   if (crash_times_.size() != kMaxCrashesPerInterval) {
     return false;
   }
   base::TimeDelta delta = base::Time::Now() - crash_times_.front();
   return delta.InSeconds() <= kCrashesIntervalInSeconds;
 }
 
 }  // namespace nacl