Use constexpr TaskTraits constructor in chrome.

chrome/browser/safe_browsing/download_protection_service.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/safe_browsing/download_protection_service.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 653 matching lines @@
         base::BindOnce(&CheckClientDownloadRequest::StartTimeout, this));
   }
 
   void StartExtractFileFeatures() {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
     DCHECK(item_);  // Called directly from Start(), item should still exist.
     // Since we do blocking I/O, offload this to a worker thread.
     // The task does not need to block shutdown.
     base::PostTaskWithTraits(
         FROM_HERE,
-        base::TaskTraits()
-            .MayBlock()
-            .WithPriority(base::TaskPriority::BACKGROUND)
-            .WithShutdownBehavior(
-                base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+        {base::MayBlock(), base::TaskPriority::BACKGROUND,
+         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
         base::BindOnce(&CheckClientDownloadRequest::ExtractFileFeatures, this,
                        item_->GetFullPath()));
   }
 
   void ExtractFileFeatures(const base::FilePath& file_path) {
     base::TimeTicks start_time = base::TimeTicks::Now();
     binary_feature_extractor_->CheckSignature(file_path, &signature_info_);
     bool is_signed = (signature_info_.certificate_chain_size() > 0);
     if (is_signed) {
       DVLOG(2) << "Downloaded a signed binary: " << file_path.value();
@@ skipping 1310 matching lines @@
           out_request->mutable_referrer_chain());
   UMA_HISTOGRAM_COUNTS_100(
       "SafeBrowsing.ReferrerURLChainSize.PPAPIDownloadAttribution",
       out_request->referrer_chain_size());
   UMA_HISTOGRAM_ENUMERATION(
       "SafeBrowsing.ReferrerAttributionResult.PPAPIDownloadAttribution", result,
       SafeBrowsingNavigationObserverManager::ATTRIBUTION_FAILURE_TYPE_MAX);
 }
 
 }  // namespace safe_browsing