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

chrome/browser/sync/sync_error_notifier_ash_unittest.cc

Index: chrome/browser/sync/sync_error_notifier_ash_unittest.cc
diff --git a/chrome/browser/sync/sync_error_notifier_ash_unittest.cc b/chrome/browser/sync/sync_error_notifier_ash_unittest.cc
index 8de7117f978b8907f7ef49111539992f3cde5f7e..6f213a55a3f291dd8c2d93941c47fa6036d1d79e 100644
--- a/chrome/browser/sync/sync_error_notifier_ash_unittest.cc
+++ b/chrome/browser/sync/sync_error_notifier_ash_unittest.cc
@@ -48,9 +48,8 @@ static const std::string kNotificationId =
 class ScreenTypeDelegateDesktop : public gfx::ScreenTypeDelegate {
  public:
   ScreenTypeDelegateDesktop() {}
-  virtual ~ScreenTypeDelegateDesktop() {}
-  virtual gfx::ScreenType GetScreenTypeForNativeView(
-      gfx::NativeView view) override {
+  ~ScreenTypeDelegateDesktop() override {}
+  gfx::ScreenType GetScreenTypeForNativeView(gfx::NativeView view) override {
     return chrome::IsNativeViewInAsh(view) ?
         gfx::SCREEN_TYPE_ALTERNATE :
         gfx::SCREEN_TYPE_NATIVE;