Update {virtual,override,final} to follow C++11 style in ash.

ash/display/resolution_notification_controller_unittest.cc

Index: ash/display/resolution_notification_controller_unittest.cc
diff --git a/ash/display/resolution_notification_controller_unittest.cc b/ash/display/resolution_notification_controller_unittest.cc
index c7c9ba447fbe6aa0f7eb803242113adf7eb009da..98a9172e50d0e72dd580ced3246a609fcb7cfb4e 100644
--- a/ash/display/resolution_notification_controller_unittest.cc
+++ b/ash/display/resolution_notification_controller_unittest.cc
@@ -51,10 +51,10 @@ class ResolutionNotificationControllerTest : public ash::test::AshTestBase {
       : accept_count_(0) {
   }
 
-  virtual ~ResolutionNotificationControllerTest() {}
+  ~ResolutionNotificationControllerTest() override {}
 
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     ash::test::AshTestBase::SetUp();
     ResolutionNotificationController::SuppressTimerForTest();
   }