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

ipc/ipc_channel_nacl.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_CHANNEL_NACL_H_
 #define IPC_IPC_CHANNEL_NACL_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 20 matching lines @@
 // sharing handles. We also currently do not support passing file descriptors or
 // named pipes, and we use background threads to emulate signaling when we can
 // read or write without blocking.
 class ChannelNacl : public Channel,
                     public internal::ChannelReader {
  public:
   // Mirror methods of Channel, see ipc_channel.h for description.
   ChannelNacl(const IPC::ChannelHandle& channel_handle,
               Mode mode,
               Listener* listener);
-  virtual ~ChannelNacl();
+  ~ChannelNacl() override;
 
   // Channel implementation.
-  virtual base::ProcessId GetPeerPID() const override;
-  virtual base::ProcessId GetSelfPID() const override;
-  virtual bool Connect() override;
-  virtual void Close() override;
-  virtual bool Send(Message* message) override;
+  base::ProcessId GetPeerPID() const override;
+  base::ProcessId GetSelfPID() const override;
+  bool Connect() override;
+  void Close() override;
+  bool Send(Message* message) override;
 
   // Posted to the main thread by ReaderThreadRunner.
   void DidRecvMsg(scoped_ptr<MessageContents> contents);
   void ReadDidFail();
 
  private:
   class ReaderThreadRunner;
 
   bool CreatePipe(const IPC::ChannelHandle& channel_handle);
   bool ProcessOutgoingMessages();
   void CallOnChannelConnected();
 
   // ChannelReader implementation.
-  virtual ReadState ReadData(char* buffer,
-                             int buffer_len,
-                             int* bytes_read) override;
-  virtual bool WillDispatchInputMessage(Message* msg) override;
-  virtual bool DidEmptyInputBuffers() override;
-  virtual void HandleInternalMessage(const Message& msg) override;
+  ReadState ReadData(char* buffer,
+                     int buffer_len,
+                     int* bytes_read) override;
+  bool WillDispatchInputMessage(Message* msg) override;
+  bool DidEmptyInputBuffers() override;
+  void HandleInternalMessage(const Message& msg) override;
 
   Mode mode_;
   bool waiting_connect_;
 
   // The pipe used for communication.
   int pipe_;
 
   // The "name" of our pipe.  On Windows this is the global identifier for
   // the pipe.  On POSIX it's used as a key in a local map of file descriptors.
   // For NaCl, we don't actually support looking up file descriptors by name,
@@ skipping 35 matching lines @@
   std::deque<linked_ptr<Message> > output_queue_;
 
   base::WeakPtrFactory<ChannelNacl> weak_ptr_factory_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelNacl);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_NACL_H_