Standardize usage of virtual/override/final in ipc/

ipc/ipc_channel_unittest.cc

 // 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.
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
@@ skipping 128 matching lines @@
   EXPECT_TRUE(WaitForClientShutdown());
 
   // Destroy the channel proxy before shutting down the thread.
   DestroyChannelProxy();
   thread.Stop();
 }
 
 class ChannelListenerWithOnConnectedSend : public IPC::TestChannelListener {
  public:
   ChannelListenerWithOnConnectedSend() {}
-  virtual ~ChannelListenerWithOnConnectedSend() {}
+  ~ChannelListenerWithOnConnectedSend() override {}
 
-  virtual void OnChannelConnected(int32 peer_pid) override {
+  void OnChannelConnected(int32 peer_pid) override {
     SendNextMessage();
   }
 };
 
 #if defined(OS_WIN)
 // Acting flakey in Windows. http://crbug.com/129595
 #define MAYBE_SendMessageInChannelConnected DISABLED_SendMessageInChannelConnected
 #else
 #define MAYBE_SendMessageInChannelConnected SendMessageInChannelConnected
 #endif
@@ skipping 31 matching lines @@
       &listener));
   CHECK(channel->Connect());
   listener.Init(channel.get());
   IPC::TestChannelListener::SendOneMessage(channel.get(), "hello from child");
 
   base::MessageLoop::current()->Run();
   return 0;
 }
 
 }  // namespace