Use TaskScheduler instead of WorkerPool in client_cert_store_chromeos.cc.

chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc

Index: chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
diff --git a/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc b/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
index b6fd2b8a432403ed57451ee7f0a33dfefdb94924..bbd797334f501ddfd0b6bd50f4eba0d55b8f7067 100644
--- a/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
+++ b/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
@@ -4,7 +4,6 @@
 
 #include "chrome/browser/chromeos/net/client_cert_store_chromeos.h"
 
-#include <memory>
 #include <string>
 
 #include "base/callback.h"
@@ -15,6 +14,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/scoped_task_scheduler.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/chromeos/certificate_provider/certificate_provider.h"
 #include "crypto/scoped_test_nss_db.h"
@@ -78,7 +78,7 @@ class TestCertFilter : public ClientCertStoreChromeOS::CertFilter {
 
 class ClientCertStoreChromeOSTest : public ::testing::Test {
  public:
-  ClientCertStoreChromeOSTest() : message_loop_(new base::MessageLoopForIO()) {}
+  ClientCertStoreChromeOSTest() {}
 
   scoped_refptr<net::X509Certificate> ImportCertToSlot(
       const std::string& cert_filename,
@@ -89,7 +89,8 @@ class ClientCertStoreChromeOSTest : public ::testing::Test {
   }
 
  private:
-  std::unique_ptr<base::MessageLoop> message_loop_;
+  base::test::ScopedTaskScheduler scoped_task_scheduler_;
+  base::MessageLoopForIO message_loop_;
 };
 
 // Ensure that cert requests, that are started before the filter is initialized,