Use constexpr TaskTraits constructor in extensions.

extensions/browser/content_hash_fetcher.cc

 // Copyright 2014 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 "extensions/browser/content_hash_fetcher.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 182 matching lines @@
       cancelled_(false) {
   bool got_id =
       content::BrowserThread::GetCurrentThreadIdentifier(&creation_thread_);
   DCHECK(got_id);
 }
 
 void ContentHashFetcherJob::Start() {
   base::FilePath verified_contents_path =
       file_util::GetVerifiedContentsPath(extension_path_);
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&ContentHashFetcherJob::LoadVerifiedContents, this,
                  verified_contents_path),
       base::Bind(&ContentHashFetcherJob::DoneCheckingForVerifiedContents,
                  this));
 }
 
 void ContentHashFetcherJob::Cancel() {
   base::AutoLock autolock(cancelled_lock_);
   cancelled_ = true;
 }
@@ skipping 104 matching lines @@
   // move to parsing this in a sandboxed helper (crbug.com/372878).
   std::unique_ptr<base::Value> parsed(base::JSONReader::Read(*response));
   if (parsed) {
     VLOG(1) << "JSON parsed ok for " << extension_id_;
 
     parsed.reset();  // no longer needed
     base::FilePath destination =
         file_util::GetVerifiedContentsPath(extension_path_);
     size_t size = response->size();
     base::PostTaskWithTraitsAndReplyWithResult(
-        FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                       base::TaskPriority::USER_VISIBLE),
+        FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
         base::Bind(&WriteFileHelper, destination, base::Passed(&response)),
         base::Bind(&ContentHashFetcherJob::OnVerifiedContentsWritten, this,
                    size));
   } else {
     DoneFetchingVerifiedContents(false);
   }
 }
 
 void ContentHashFetcherJob::OnVerifiedContentsWritten(size_t expected_size,
                                                       int write_result) {
@@ skipping 197 matching lines @@
 
   for (JobMap::iterator i = jobs_.begin(); i != jobs_.end(); ++i) {
     if (i->second.get() == job.get()) {
       jobs_.erase(i);
       break;
     }
   }
 }
 
 }  // namespace extensions