Use TaskScheduler instead of blocking pool in supervised_user_service.cc.

chrome/browser/supervised_user/supervised_user_service.cc

Index: chrome/browser/supervised_user/supervised_user_service.cc
diff --git a/chrome/browser/supervised_user/supervised_user_service.cc b/chrome/browser/supervised_user/supervised_user_service.cc
index 2acd84abd580ed53bb470fb493aca712889a6de4..0010c22c72bb65735b84c8bd39c78255cc74445b 100644
--- a/chrome/browser/supervised_user/supervised_user_service.cc
+++ b/chrome/browser/supervised_user/supervised_user_service.cc
@@ -17,7 +17,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
-#include "base/threading/sequenced_worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/version.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
@@ -755,10 +755,14 @@ void SupervisedUserService::LoadBlacklist(const base::FilePath& path,
   DCHECK(blacklist_state_ == BlacklistLoadState::NOT_LOADED);
   blacklist_state_ = BlacklistLoadState::LOAD_STARTED;
   base::PostTaskAndReplyWithResult(
-      BrowserThread::GetBlockingPool()->GetTaskRunnerWithShutdownBehavior(
-          base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN).get(),
-      FROM_HERE,
-      base::Bind(&base::PathExists, path),
+      base::CreateTaskRunnerWithTraits(

[Bernhard Bauer, 2017/04/25 14:18:23]

Can you use PostTaskWithTraitsAndReplyWithResult() for this?

[fdoray, 2017/04/27 13:03:17]

Done.

+          base::TaskTraits()
+              .MayBlock()
+              .WithPriority(base::TaskPriority::BACKGROUND)
+              .WithShutdownBehavior(
+                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))
+          .get(),
+      FROM_HERE, base::Bind(&base::PathExists, path),
       base::Bind(&SupervisedUserService::OnBlacklistFileChecked,
                  weak_ptr_factory_.GetWeakPtr(), path, url));
 }