Use TaskScheduler instead of WorkerPool in client_cert_store_chromeos.cc.

chrome/browser/chromeos/net/client_cert_store_chromeos.cc

Index: chrome/browser/chromeos/net/client_cert_store_chromeos.cc
diff --git a/chrome/browser/chromeos/net/client_cert_store_chromeos.cc b/chrome/browser/chromeos/net/client_cert_store_chromeos.cc
index 7174c202c38c00a4fdb2430ae3fd565fadc383ad..3ecc1e26397368352a4a925d04384197597c971c 100644
--- a/chrome/browser/chromeos/net/client_cert_store_chromeos.cc
+++ b/chrome/browser/chromeos/net/client_cert_store_chromeos.cc
@@ -12,7 +12,7 @@
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
-#include "base/threading/worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "chrome/browser/chromeos/certificate_provider/certificate_provider.h"
 #include "crypto/nss_crypto_module_delegate.h"
 #include "net/ssl/ssl_cert_request_info.h"
@@ -81,18 +81,13 @@ void ClientCertStoreChromeOS::GotAdditionalCerts(
     password_delegate.reset(
         password_delegate_factory_.Run(request->host_and_port));
   }
-  if (base::WorkerPool::PostTaskAndReply(
-          FROM_HERE,
-          base::Bind(&ClientCertStoreChromeOS::GetAndFilterCertsOnWorkerThread,
-                     base::Unretained(this), base::Passed(&password_delegate),
-                     request, additional_certs, selected_certs),
-          callback, true)) {
-    return;
-  }
-  // If the task could not be posted, behave as if there were no certificates
-  // which requires to clear |selected_certs|.
-  selected_certs->clear();
-  callback.Run();
+  base::PostTaskWithTraitsAndReply(
+      FROM_HERE,
+      base::TaskTraits().WithPriority(base::TaskPriority::BACKGROUND),
+      base::Bind(&ClientCertStoreChromeOS::GetAndFilterCertsOnWorkerThread,
+                 base::Unretained(this), base::Passed(&password_delegate),
+                 request, additional_certs, selected_certs),
+      callback);
 }
 
 void ClientCertStoreChromeOS::GetAndFilterCertsOnWorkerThread(