replace 'virtual ... OVERRIDE' with '... override'

base/async_socket_io_handler.h

 // Copyright 2013 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 BASE_ASYNC_SOCKET_IO_HANDLER_H_
 #define BASE_ASYNC_SOCKET_IO_HANDLER_H_
 
 #include "base/message_loop/message_loop.h"
 #include "base/sync_socket.h"
 #include "base/threading/non_thread_safe.h"
@@ skipping 58 matching lines @@
 
   // Attempts to read from the socket.  The return value will be |false|
   // if an error occurred and |true| if data was read or a pending read
   // was issued.  Regardless of async or sync operation, the
   // ReadCompleteCallback (see above) will be called when data is available.
   bool Read(char* buffer, int buffer_len);
 
  private:
 #if defined(OS_WIN)
   // Implementation of IOHandler on Windows.
-  virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
-                             DWORD bytes_transfered,
-                             DWORD error) OVERRIDE;
+  void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
+                     DWORD bytes_transfered,
+                     DWORD error) override;
 #elif defined(OS_POSIX)
   // Implementation of base::MessageLoopForIO::Watcher.
-  virtual void OnFileCanWriteWithoutBlocking(int socket) OVERRIDE {}
-  virtual void OnFileCanReadWithoutBlocking(int socket) OVERRIDE;
+  void OnFileCanWriteWithoutBlocking(int socket) override {}
+  void OnFileCanReadWithoutBlocking(int socket) override;
 
   void EnsureWatchingSocket();
 #endif
 
   base::SyncSocket::Handle socket_;
 #if defined(OS_WIN)
   base::MessageLoopForIO::IOContext* context_;
   bool is_pending_;
 #elif defined(OS_POSIX)
   base::MessageLoopForIO::FileDescriptorWatcher socket_watcher_;
   // |pending_buffer_| and |pending_buffer_len_| are valid only between
   // Read() and OnFileCanReadWithoutBlocking().
   char* pending_buffer_;
   int pending_buffer_len_;
   // |true| iff the message loop is watching the socket for IO events.
   bool is_watching_;
 #endif
   ReadCompleteCallback read_complete_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncSocketIoHandler);
 };
 
 }  // namespace base.
 
 #endif  // BASE_ASYNC_SOCKET_IO_HANDLER_H_