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

chrome/browser/signin/signin_error_notifier_ash_unittest.cc

Index: chrome/browser/signin/signin_error_notifier_ash_unittest.cc
diff --git a/chrome/browser/signin/signin_error_notifier_ash_unittest.cc b/chrome/browser/signin/signin_error_notifier_ash_unittest.cc
index 3cb2e57be35ba301c01414836f0b61fe752d5f49..8cd42ef3f6a89b6575e251b2733ca2f2dd40fa14 100644
--- a/chrome/browser/signin/signin_error_notifier_ash_unittest.cc
+++ b/chrome/browser/signin/signin_error_notifier_ash_unittest.cc
@@ -48,8 +48,7 @@ static const std::string kNotificationId =
 class ScreenTypeDelegateDesktop : public gfx::ScreenTypeDelegate {
  public:
   ScreenTypeDelegateDesktop() {}
-  virtual gfx::ScreenType GetScreenTypeForNativeView(
-      gfx::NativeView view) override {
+  gfx::ScreenType GetScreenTypeForNativeView(gfx::NativeView view) override {
     return chrome::IsNativeViewInAsh(view) ?
         gfx::SCREEN_TYPE_ALTERNATE :
         gfx::SCREEN_TYPE_NATIVE;