Standardize usage of virtual/override/final in content/

content/child/child_thread.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 "content/child/child_thread.h"
 
 #include <signal.h>
 
 #include <string>
 
@@ skipping 99 matching lines @@
   WaitAndExitDelegate* leaking_delegate = delegate.release();
   ANNOTATE_LEAKING_OBJECT_PTR(leaking_delegate);
   ignore_result(leaking_delegate);
   return true;
 }
 #endif
 
 class SuicideOnChannelErrorFilter : public IPC::MessageFilter {
  public:
   // IPC::MessageFilter
-  virtual void OnChannelError() override {
+  void OnChannelError() override {
     // For renderer/worker processes:
     // On POSIX, at least, one can install an unload handler which loops
     // forever and leave behind a renderer process which eats 100% CPU forever.
     //
     // This is because the terminate signals (ViewMsg_ShouldClose and the error
     // from the IPC sender) are routed to the main message loop but never
     // processed (because that message loop is stuck in V8).
     //
     // One could make the browser SIGKILL the renderers, but that leaves open a
     // large window where a browser failure (or a user, manually terminating
@@ skipping 13 matching lines @@
     // Invoke LeakSanitizer early to avoid detecting shutdown-only leaks. If
     // leaks are found, the process will exit here.
     __lsan_do_leak_check();
 #endif
 #else
     _exit(0);
 #endif
   }
 
  protected:
-  virtual ~SuicideOnChannelErrorFilter() {}
+  ~SuicideOnChannelErrorFilter() override {}
 };
 
 #endif  // OS(POSIX)
 
 #if defined(OS_ANDROID)
 ChildThread* g_child_thread = NULL;
 
 // A lock protects g_child_thread.
 base::LazyInstance<base::Lock> g_lazy_child_thread_lock =
     LAZY_INSTANCE_INITIALIZER;
@@ skipping 430 matching lines @@
 
 void ChildThread::OnProcessBackgrounded(bool background) {
   // Set timer slack to maximum on main thread when in background.
   base::TimerSlack timer_slack = base::TIMER_SLACK_NONE;
   if (background)
     timer_slack = base::TIMER_SLACK_MAXIMUM;
   base::MessageLoop::current()->SetTimerSlack(timer_slack);
 }
 
 }  // namespace content