Use constexpr TaskTraits constructor in content.

content/browser/storage_partition_impl_map.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 "content/browser/storage_partition_impl_map.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 502 matching lines @@
   }
 
   // Start a best-effort delete of the on-disk storage excluding paths that are
   // known to still be in use. This is to delete any previously created
   // StoragePartition state that just happens to not have been used during this
   // run of the browser.
   base::FilePath domain_root = browser_context_->GetPath().Append(
       GetStoragePartitionDomainPath(partition_domain));
 
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&BlockingObliteratePath, browser_context_->GetPath(),
                  domain_root, paths_to_keep,
                  base::ThreadTaskRunnerHandle::Get(), on_gc_required));
 }
 
 void StoragePartitionImplMap::GarbageCollect(
     std::unique_ptr<base::hash_set<base::FilePath>> active_paths,
     const base::Closure& done) {
   // Include all paths for current StoragePartitions in the active_paths since
   // they cannot be deleted safely.
@@ skipping 74 matching lines @@
 
     // We do not call InitializeURLRequestContext() for media contexts because,
     // other than the HTTP cache, the media contexts share the same backing
     // objects as their associated "normal" request context.  Thus, the previous
     // call serves to initialize the media request context for this storage
     // partition as well.
   }
 }
 
 }  // namespace content