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

base/process/kill_posix.cc

 // Copyright (c) 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.
 
 #include "base/process/kill.h"
 
 #include <signal.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
@@ skipping 392 matching lines @@
 // A thread class which waits for the given child to exit and reaps it.
 // If the child doesn't exit within a couple of seconds, kill it.
 class BackgroundReaper : public PlatformThread::Delegate {
  public:
   BackgroundReaper(pid_t child, unsigned timeout)
       : child_(child),
         timeout_(timeout) {
   }
 
   // Overridden from PlatformThread::Delegate:
-  virtual void ThreadMain() OVERRIDE {
+  void ThreadMain() override {
     WaitForChildToDie();
     delete this;
   }
 
   void WaitForChildToDie() {
     // Wait forever case.
     if (timeout_ == 0) {
       pid_t r = HANDLE_EINTR(waitpid(child_, NULL, 0));
       if (r != child_) {
         DPLOG(ERROR) << "While waiting for " << child_
@@ skipping 49 matching lines @@
   if (IsChildDead(process))
     return;
 
   BackgroundReaper* reaper = new BackgroundReaper(process, 0);
   PlatformThread::CreateNonJoinable(0, reaper);
 }
 
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace base