Use TaskScheduler instead of blocking pool in supervised_user_site_list.cc.

chrome/browser/supervised_user/supervised_user_site_list.cc

Index: chrome/browser/supervised_user/supervised_user_site_list.cc
diff --git a/chrome/browser/supervised_user/supervised_user_site_list.cc b/chrome/browser/supervised_user/supervised_user_site_list.cc
index 8b9253b26ec009f5991b94c4d2a557e31c4b5b6e..8672659787954b24802450aa6407c9eb16c6b05c 100644
--- a/chrome/browser/supervised_user/supervised_user_site_list.cc
+++ b/chrome/browser/supervised_user/supervised_user_site_list.cc
@@ -12,9 +12,8 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task_runner_util.h"
-#include "base/threading/sequenced_worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/values.h"
-#include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 const int kLegacyWhitelistFormatVersion = 2;
@@ -92,9 +91,12 @@ void SupervisedUserSiteList::Load(const std::string& id,
                                   const base::FilePath& path,
                                   const LoadedCallback& callback) {
   base::PostTaskAndReplyWithResult(
-      content::BrowserThread::GetBlockingPool()
-          ->GetTaskRunnerWithShutdownBehavior(
-              base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN)
+      base::CreateTaskRunnerWithTraits(

[Bernhard Bauer, 2017/04/25 14:20:21]

Can you use PostTaskWithTraitsAndReplyWithResult() here?

[fdoray, 2017/04/26 19:33:50]

Done.

+          base::TaskTraits()
+              .MayBlock()
+              .WithPriority(base::TaskPriority::BACKGROUND)
+              .WithShutdownBehavior(
+                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))
           .get(),
       FROM_HERE, base::Bind(&ReadFileOnBlockingThread, path),
       base::Bind(&SupervisedUserSiteList::OnJsonLoaded, id, title,