Run ScopedTaskScheduler tasks synchronously.

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 bbd797334f501ddfd0b6bd50f4eba0d55b8f7067..3621e9e11895081b8b4e6511432611506d4f8db2 100644
--- a/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
+++ b/chrome/browser/chromeos/net/client_cert_store_chromeos_unittest.cc
@@ -11,7 +11,6 @@
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
-#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"
@@ -90,7 +89,6 @@ class ClientCertStoreChromeOSTest : public ::testing::Test {
 
  private:
   base::test::ScopedTaskScheduler scoped_task_scheduler_;
-  base::MessageLoopForIO message_loop_;
 };
 
 // Ensure that cert requests, that are started before the filter is initialized,