Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/login.

chrome/browser/chromeos/login/app_launch_controller.cc

Index: chrome/browser/chromeos/login/app_launch_controller.cc
diff --git a/chrome/browser/chromeos/login/app_launch_controller.cc b/chrome/browser/chromeos/login/app_launch_controller.cc
index fa62009cfa7ac4ee27975366d88b8296fe980995..004ac856d30a1d791c97f106d19a7a4b13beb662 100644
--- a/chrome/browser/chromeos/login/app_launch_controller.cc
+++ b/chrome/browser/chromeos/login/app_launch_controller.cc
@@ -76,13 +76,11 @@ class AppLaunchController::AppWindowWatcher
       window_registry_->AddObserver(this);
     }
   }
-  virtual ~AppWindowWatcher() {
-    window_registry_->RemoveObserver(this);
-  }
+  ~AppWindowWatcher() override { window_registry_->RemoveObserver(this); }
 
  private:
   // extensions::AppWindowRegistry::Observer overrides:
-  virtual void OnAppWindowAdded(extensions::AppWindow* app_window) override {
+  void OnAppWindowAdded(extensions::AppWindow* app_window) override {
     if (app_window->extension_id() == app_id_) {
       window_registry_->RemoveObserver(this);
       NotifyAppWindowCreated();