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

ash/system/chromeos/screen_security/screen_tray_item_unittest.cc

 // 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.
 
 #include "ash/system/chromeos/screen_security/screen_tray_item.h"
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/screen_security/screen_capture_tray_item.h"
 #include "ash/system/chromeos/screen_security/screen_share_tray_item.h"
 #include "ash/system/tray/tray_item_view.h"
@@ skipping 28 matching lines @@
                                       click_location_in_local,
                                       click_location_in_local,
                                       ui::EF_NONE,
                                       ui::EF_NONE));
 }
 
 class ScreenTrayItemTest : public ash::test::AshTestBase {
  public:
   ScreenTrayItemTest()
       : tray_item_(NULL), stop_callback_hit_count_(0) {}
-  virtual ~ScreenTrayItemTest() {}
+  ~ScreenTrayItemTest() override {}
 
   ScreenTrayItem* tray_item() { return tray_item_; }
   void set_tray_item(ScreenTrayItem* tray_item) { tray_item_ = tray_item; }
 
   int stop_callback_hit_count() const { return stop_callback_hit_count_; }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     test::AshTestBase::SetUp();
     TrayItemView::DisableAnimationsForTest();
   }
 
   void StartSession() {
     tray_item_->Start(
         base::Bind(&ScreenTrayItemTest::StopCallback, base::Unretained(this)));
   }
 
   void StopSession() {
     tray_item_->Stop();
   }
 
   void StopCallback() {
     stop_callback_hit_count_++;
   }
 
  private:
   ScreenTrayItem* tray_item_;
   int stop_callback_hit_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenTrayItemTest);
 };
 
 class ScreenCaptureTest : public ScreenTrayItemTest {
  public:
   ScreenCaptureTest() {}
-  virtual ~ScreenCaptureTest() {}
+  ~ScreenCaptureTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ScreenTrayItemTest::SetUp();
     // This tray item is owned by its parent system tray view and will
     // be deleted automatically when its parent is destroyed in AshTestBase.
     ScreenTrayItem* tray_item = new ScreenCaptureTrayItem(GetSystemTray());
     GetSystemTray()->AddTrayItem(tray_item);
     set_tray_item(tray_item);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureTest);
 };
 
 class ScreenShareTest : public ScreenTrayItemTest {
  public:
   ScreenShareTest() {}
-  virtual ~ScreenShareTest() {}
+  ~ScreenShareTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ScreenTrayItemTest::SetUp();
     // This tray item is owned by its parent system tray view and will
     // be deleted automatically when its parent is destroyed in AshTestBase.
     ScreenTrayItem* tray_item = new ScreenShareTrayItem(GetSystemTray());
     GetSystemTray()->AddTrayItem(tray_item);
     set_tray_item(tray_item);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScreenShareTest);
 };
@@ skipping 103 matching lines @@
 
 TEST_F(ScreenCaptureTest, SystemTrayInteraction) {
   TestSystemTrayInteraction(this);
 }
 
 TEST_F(ScreenShareTest, SystemTrayInteraction) {
   TestSystemTrayInteraction(this);
 }
 
 }  // namespace ash