Standardize usage of virtual/override/final specifiers in ui/.

ui/app_list/folder_image_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 <string>
 
 #include "ui/app_list/folder_image.h"
 
 #include "base/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 38 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TestFolderImageObserver);
 };
 
 }  // namespace
 
 class FolderImageTest : public testing::Test {
  public:
   FolderImageTest() : folder_image_(app_list_model_.top_level_item_list()) {}
 
-  ~FolderImageTest() {}
+  ~FolderImageTest() override {}
 
-  void SetUp() {
+  void SetUp() override {
     // Populate the AppListModel with three items (to test that the FolderImage
     // correctly supports having fewer than four icons).
     AddAppWithColoredIcon("app1", SK_ColorRED);
     AddAppWithColoredIcon("app2", SK_ColorGREEN);
     AddAppWithColoredIcon("app3", SK_ColorBLUE);
 
     observer_.Reset();
     folder_image_.AddObserver(&observer_);
   }
 
-  void TearDown() { folder_image_.RemoveObserver(&observer_); }
+  void TearDown() override { folder_image_.RemoveObserver(&observer_); }
 
  protected:
   void AddAppWithColoredIcon(const std::string& id, SkColor icon_color) {
     scoped_ptr<AppListItem> item(new AppListItem(id));
     item->SetIcon(CreateSquareBitmapWithColor(kListIconSize, icon_color),
                   false);
     app_list_model_.AddItem(item.Pass());
   }
 
   AppListModel app_list_model_;
@@ skipping 56 matching lines @@
 
   // Change an item's icon. Ensure that the observer fired and the icon changed.
   app_list_model_.FindItem("app2")->SetIcon(
       CreateSquareBitmapWithColor(kListIconSize, SK_ColorMAGENTA), false);
   EXPECT_TRUE(observer_.updated());
   observer_.Reset();
   EXPECT_FALSE(ImagesAreEqual(icon1, folder_image_.icon()));
 }
 
 }  // namespace app_list