Use constexpr TaskTraits constructor in chrome.

chrome/browser/android/offline_pages/evaluation/offline_page_evaluation_bridge.cc

 // Copyright 2016 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/android/offline_pages/evaluation/offline_page_evaluation_bridge.h"
 
 #include "base/android/callback_android.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 113 matching lines @@
                           const MultipleItemStatuses& removed_request_results) {
   base::android::RunCallbackAndroid(j_callback_obj,
                                     int(removed_request_results.size()));
 }
 
 std::unique_ptr<KeyedService> GetTestingRequestCoordinator(
     content::BrowserContext* context,
     std::unique_ptr<OfflinerPolicy> policy,
     std::unique_ptr<Offliner> offliner) {
   scoped_refptr<base::SequencedTaskRunner> background_task_runner =
-      base::CreateSequencedTaskRunnerWithTraits(base::TaskTraits().MayBlock());
+      base::CreateSequencedTaskRunnerWithTraits({base::MayBlock()});
   Profile* profile = Profile::FromBrowserContext(context);
   base::FilePath queue_store_path =
       profile->GetPath().Append(chrome::kOfflinePageRequestQueueDirname);
 
   std::unique_ptr<RequestQueueStoreSQL> queue_store(
       new RequestQueueStoreSQL(background_task_runner, queue_store_path));
   std::unique_ptr<RequestQueue> queue(new RequestQueue(std::move(queue_store)));
   std::unique_ptr<android::EvaluationTestScheduler> scheduler(
       new android::EvaluationTestScheduler());
   net::NetworkQualityEstimator::NetworkQualityProvider*
@@ skipping 237 matching lines @@
     return;
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = weak_java_ref_.get(env);
   if (obj.is_null())
     return;
   Java_OfflinePageEvaluationBridge_offlinePageModelLoaded(env, obj);
 }
 
 }  // namespace android
 }  // namespace offline_pages