Standardize usage of virtual/override/final in ipc/

ipc/ipc_forwarding_message_filter.h

 // Copyright (c) 2012 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 IPC_IPC_FORWARDING_MESSAGE_FILTER_H_
 #define IPC_IPC_FORWARDING_MESSAGE_FILTER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 27 matching lines @@
   ForwardingMessageFilter(
       const uint32* message_ids_to_filter,
       size_t num_message_ids_to_filter,
       base::TaskRunner* target_task_runner);
 
   // Define the message routes to be filtered.
   void AddRoute(int routing_id, const Handler& handler);
   void RemoveRoute(int routing_id);
 
   // MessageFilter methods:
-  virtual bool OnMessageReceived(const Message& message) override;
+  bool OnMessageReceived(const Message& message) override;
 
  private:
-  virtual ~ForwardingMessageFilter();
+  ~ForwardingMessageFilter() override;
 
   std::set<int> message_ids_to_filter_;
 
   // The handler_ only gets Run on the thread corresponding to
   // target_task_runner_.
   scoped_refptr<base::TaskRunner> target_task_runner_;
 
   // Protects access to routes_.
   base::Lock handlers_lock_;
 
   // Indicates the routing_ids for which messages should be filtered.
   std::map<int, Handler> handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(ForwardingMessageFilter);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_FORWARDING_MESSAGE_FILTER_H_