Update {virtual,override} to follow C++11 style in ipc.

ipc/ipc_channel_nacl.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 "ipc/ipc_channel_nacl.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <sys/types.h>
 
@@ skipping 62 matching lines @@
   // |main_message_loop|: A proxy for the main thread, where we will invoke the
   //                      above callbacks.
   ReaderThreadRunner(
       int pipe,
       base::Callback<void (scoped_ptr<MessageContents>)> data_read_callback,
       base::Callback<void ()> failure_callback,
       scoped_refptr<base::MessageLoopProxy> main_message_loop);
 
   // DelegateSimpleThread implementation. Reads data from the pipe in a loop
   // until either we are told to quit or a read fails.
-  virtual void Run() override;
+  void Run() override;
 
  private:
   int pipe_;
   base::Callback<void (scoped_ptr<MessageContents>)> data_read_callback_;
   base::Callback<void ()> failure_callback_;
   scoped_refptr<base::MessageLoopProxy> main_message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(ReaderThreadRunner);
 };
 
@@ skipping 278 matching lines @@
 // Channel's methods
 
 // static
 scoped_ptr<Channel> Channel::Create(
     const IPC::ChannelHandle &channel_handle, Mode mode, Listener* listener) {
   return scoped_ptr<Channel>(
       new ChannelNacl(channel_handle, mode, listener));
 }
 
 }  // namespace IPC