Standardize usage of virtual/override/final in ipc/

ipc/ipc_test_sink.h

 // Copyright (c) 2011 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_TEST_SINK_H_
 #define IPC_IPC_TEST_SINK_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 55 matching lines @@
 //   StartSomeAsynchronousProcess(&test_sink);
 //   MessageLoop::current()->Run();
 //   <inspect the results>
 //   ...
 //
 // To hook up the sink, all you need to do is call OnMessageReceived when a
 // message is received.
 class TestSink : public Channel {
  public:
   TestSink();
-  virtual ~TestSink();
+  ~TestSink() override;
 
   // Interface in IPC::Channel. This copies the message to the sink and then
   // deletes it.
-  virtual bool Send(IPC::Message* message) override;
-  virtual bool Connect() override WARN_UNUSED_RESULT;
-  virtual void Close() override;
-  virtual base::ProcessId GetPeerPID() const override;
-  virtual base::ProcessId GetSelfPID() const override;
+  bool Send(IPC::Message* message) override;
+  bool Connect() override WARN_UNUSED_RESULT;
+  void Close() override;
+  base::ProcessId GetPeerPID() const override;
+  base::ProcessId GetSelfPID() const override;
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
-  virtual int GetClientFileDescriptor() const override;
-  virtual base::ScopedFD TakeClientFileDescriptor() override;
+  int GetClientFileDescriptor() const override;
+  base::ScopedFD TakeClientFileDescriptor() override;
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
   // Used by the source of the messages to send the message to the sink. This
   // will make a copy of the message and store it in the list.
   bool OnMessageReceived(const Message& msg);
 
   // Returns the number of messages in the queue.
   size_t message_count() const { return messages_.size(); }
 
   // Clears the message queue of saved messages.
@@ skipping 30 matching lines @@
   // The actual list of received messages.
   std::vector<Message> messages_;
   ObserverList<Listener> filter_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSink);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_TEST_SINK_H_