Standardize usage of virtual/override/final specifiers.

ash/system/web_notification/ash_popup_alignment_delegate_unittest.cc

 // Copyright 2014 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/web_notification/ash_popup_alignment_delegate.h"
 
 #include <vector>
 
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/gfx/screen.h"
 #include "ui/message_center/message_center_style.h"
 
 namespace ash {
 
 class AshPopupAlignmentDelegateTest : public test::AshTestBase {
  public:
   AshPopupAlignmentDelegateTest() {}
-  virtual ~AshPopupAlignmentDelegateTest() {}
+  ~AshPopupAlignmentDelegateTest() override {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     test::AshTestBase::SetUp();
     alignment_delegate_.reset(new AshPopupAlignmentDelegate());
     alignment_delegate_->StartObserving(
         Shell::GetScreen(), Shell::GetScreen()->GetPrimaryDisplay());
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     alignment_delegate_.reset();
     test::AshTestBase::TearDown();
   }
 
  protected:
   enum Position {
     TOP_LEFT,
     TOP_RIGHT,
     BOTTOM_LEFT,
     BOTTOM_RIGHT,
@@ skipping 146 matching lines @@
 
   const int kTrayHeight = 100;
   alignment_delegate()->SetSystemTrayHeight(kTrayHeight);
 
   EXPECT_EQ(origin_x, alignment_delegate()->GetToastOriginX(toast_size));
   EXPECT_EQ(baseline - kTrayHeight - message_center::kMarginBetweenItems,
             alignment_delegate()->GetBaseLine());
 }
 
 }  // namespace ash