Standardize usage of virtual/override/final specifiers.

ui/app_list/views/app_list_main_view.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 "ui/app_list/views/app_list_main_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 39 matching lines @@
              AppListItem* item,
              float scale)
       : owner_(owner),
         item_(item) {
     item_->AddObserver(this);
 
     // Triggers icon loading for given |scale_factor|.
     item_->icon().GetRepresentation(scale);
   }
 
-  virtual ~IconLoader() {
-    item_->RemoveObserver(this);
-  }
+  ~IconLoader() override { item_->RemoveObserver(this); }
 
  private:
   // AppListItemObserver overrides:
-  virtual void ItemIconChanged() override {
+  void ItemIconChanged() override {
     owner_->OnItemIconLoaded(this);
     // Note that IconLoader is released here.
   }
 
   AppListMainView* owner_;
   AppListItem* item_;
 
   DISALLOW_COPY_AND_ASSIGN(IconLoader);
 };
 
@@ skipping 227 matching lines @@
   // Resubmit the query via a posted task so that all observers for the
   // uninstall notification are notified.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&AppListMainView::QueryChanged,
                  weak_ptr_factory_.GetWeakPtr(),
                  search_box_view_));
 }
 
 }  // namespace app_list