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

base/synchronization/waitable_event_watcher.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 BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_
 #define BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_
 
 #include "base/base_export.h"
 #include "build/build_config.h"
 
@@ skipping 74 matching lines @@
   // Return the currently watched event, or NULL if no object is currently being
   // watched.
   WaitableEvent* GetWatchedEvent();
 
   // Return the callback that will be invoked when the event is
   // signaled.
   const EventCallback& callback() const { return callback_; }
 
  private:
 #if defined(OS_WIN)
-  virtual void OnObjectSignaled(HANDLE h) OVERRIDE;
+  void OnObjectSignaled(HANDLE h) override;
   win::ObjectWatcher watcher_;
 #else
   // Implementation of MessageLoop::DestructionObserver
-  virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
+  void WillDestroyCurrentMessageLoop() override;
 
   MessageLoop* message_loop_;
   scoped_refptr<Flag> cancel_flag_;
   AsyncWaiter* waiter_;
   base::Closure internal_callback_;
   scoped_refptr<WaitableEvent::WaitableEventKernel> kernel_;
 #endif
 
   WaitableEvent* event_;
   EventCallback callback_;
 };
 
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_