Standardize usage of virtual/override/final specifiers.

ash/shelf/shelf_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/shelf/shelf.h"
 #include "ash/shelf/shelf_button.h"
 #include "ash/shelf/shelf_item_delegate_manager.h"
 #include "ash/shelf/shelf_model.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shelf/shelf_widget.h"
@@ skipping 19 matching lines @@
 namespace ash {
 
 class ShelfTest : public ash::test::AshTestBase {
  public:
   ShelfTest()
       : shelf_(NULL),
         shelf_view_(NULL),
         shelf_model_(NULL),
         item_delegate_manager_(NULL) {}
 
-  virtual ~ShelfTest() {}
+  ~ShelfTest() override {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     test::AshTestBase::SetUp();
 
     shelf_ = Shelf::ForPrimaryDisplay();
     ASSERT_TRUE(shelf_);
 
     test::ShelfTestAPI test(shelf_);
     shelf_view_ = test.shelf_view();
     shelf_model_ = shelf_view_->model();
     item_delegate_manager_ =
         Shell::GetInstance()->shelf_item_delegate_manager();
 
     test_.reset(new ash::test::ShelfViewTestAPI(shelf_view_));
   }
 
-  virtual void TearDown() override {
-    test::AshTestBase::TearDown();
-  }
+  void TearDown() override { test::AshTestBase::TearDown(); }
 
   Shelf* shelf() {
     return shelf_;
   }
 
   ShelfView* shelf_view() {
     return shelf_view_;
   }
 
   ShelfModel* shelf_model() {
@@ skipping 85 matching lines @@
 
   // Removes the first item in main shelf view.
   shelf_model()->RemoveItemAt(shelf_model()->ItemIndexByID(first_item_id));
 
   // Waits for all transitions to finish and there should be no crash.
   test_api()->RunMessageLoopUntilAnimationsDone();
   EXPECT_FALSE(shelf()->IsShowingOverflowBubble());
 }
 
 }  // namespace ash