Move scoped_temp_dir from base to base/files

chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc

Index: chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc
diff --git a/chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc b/chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc
index 0f423ee50602bb764de3b836484262891e7da518..67ec53153541029a2218093c13a006f7c8e9fa91 100644
--- a/chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc
+++ b/chrome/browser/system_monitor/removable_device_notifications_chromeos_unittest.cc
@@ -7,10 +7,10 @@
 #include "chrome/browser/system_monitor/removable_device_notifications_chromeos.h"
 
 #include "base/file_util.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/scoped_temp_dir.h"
 #include "base/system_monitor/system_monitor.h"
 #include "base/test/mock_devices_changed_observer.h"
 #include "base/utf_string_conversions.h"
@@ -166,7 +166,7 @@ class RemovableDeviceNotificationsCrosTest : public testing::Test {
   content::TestBrowserThread file_thread_;
 
   // Temporary directory for created test data.
-  ScopedTempDir scoped_temp_dir_;
+  base::ScopedTempDir scoped_temp_dir_;
 
   // Objects that talks with RemovableDeviceNotificationsCros.
   base::SystemMonitor system_monitor_;