Standardize usage of virtual/override/final specifiers.

ash/test/test_system_tray_delegate.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_
 
 #include "ash/system/tray/default_system_tray_delegate.h"
 #include "base/time/time.h"
 
 namespace ash {
 namespace test {
 
 class TestSystemTrayDelegate : public DefaultSystemTrayDelegate {
  public:
   TestSystemTrayDelegate();
-  virtual ~TestSystemTrayDelegate();
+  ~TestSystemTrayDelegate() override;
 
   // Changes the login status when initially the delegate is created. This will
   // be called before AshTestBase::SetUp() to test the case when chrome is
   // restarted right after the login (such like a flag is set).
   // This value will be reset in AshTestHelper::TearDown,  most test fixtures
   // don't need to care its lifecycle.
   static void SetInitialLoginStatus(user::LoginStatus login_status);
 
   // Changes the current login status in the test. This also invokes
   // UpdateAfterLoginStatusChange(). Usually this is called in the test code to
   // set up a login status. This will fit to most of the test cases, but this
   // cannot be set during the initialization. To test the initialization,
   // consider using SetInitialLoginStatus() instead.
   void SetLoginStatus(user::LoginStatus login_status);
 
   void set_should_show_display_notification(bool should_show) {
     should_show_display_notification_ = should_show;
   }
 
   // Updates the session length limit so that the limit will come from now in
   // |new_limit|.
   void SetSessionLengthLimitForTest(const base::TimeDelta& new_limit);
 
   // Clears the session length limit.
   void ClearSessionLengthLimit();
 
   // Overridden from SystemTrayDelegate:
-  virtual user::LoginStatus GetUserLoginStatus() const override;
-  virtual bool IsUserSupervised() const override;
-  virtual bool ShouldShowDisplayNotification() override;
-  virtual bool GetSessionStartTime(
-      base::TimeTicks* session_start_time) override;
-  virtual bool GetSessionLengthLimit(
-      base::TimeDelta* session_length_limit) override;
-  virtual void ShutDown() override;
-  virtual void SignOut() override;
+  user::LoginStatus GetUserLoginStatus() const override;
+  bool IsUserSupervised() const override;
+  bool ShouldShowDisplayNotification() override;
+  bool GetSessionStartTime(base::TimeTicks* session_start_time) override;
+  bool GetSessionLengthLimit(base::TimeDelta* session_length_limit) override;
+  void ShutDown() override;
+  void SignOut() override;
 
  private:
   bool should_show_display_notification_;
   user::LoginStatus login_status_;
   base::TimeDelta session_length_limit_;
   bool session_length_limit_set_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSystemTrayDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_