Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/content_settings/permission_context_base.h

 // 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.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_CONTEXT_BASE_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_CONTEXT_BASE_H_
 
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
@@ skipping 34 matching lines @@
 // After this you can override several other methods to customize behavior,
 // in particular it is advised to override UpdateTabContext in order to manage
 // the permission from the omnibox.
 // See midi_permission_context.h/cc or push_permission_context.cc/h for some
 // examples.
 
 class PermissionContextBase : public KeyedService {
  public:
   PermissionContextBase(Profile* profile,
                         const ContentSettingsType permission_type);
-  virtual ~PermissionContextBase();
+  ~PermissionContextBase() override;
 
   // The renderer is requesting permission to push messages.
   // When the answer to a permission request has been determined, |callback|
   // should be called with the result.
   virtual void RequestPermission(content::WebContents* web_contents,
                                  const PermissionRequestID& id,
                                  const GURL& requesting_frame,
                                  bool user_gesture,
                                  const BrowserPermissionCallback& callback);
 
@@ skipping 54 matching lines @@
   scoped_ptr<PermissionQueueController> permission_queue_controller_;
   base::ScopedPtrHashMap<std::string, PermissionBubbleRequest>
       pending_bubbles_;
 
   // Must be the last member, to ensure that it will be
   // destroyed first, which will invalidate weak pointers
   base::WeakPtrFactory<PermissionContextBase> weak_factory_;
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_CONTEXT_BASE_H_