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

base/mac/libdispatch_task_runner.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_MAC_LIBDISPATCH_SEQUENCED_TASK_RUNNER_H_
 #define BASE_MAC_LIBDISPATCH_SEQUENCED_TASK_RUNNER_H_
 
 #include <dispatch/dispatch.h>
 
 #include "base/single_thread_task_runner.h"
@@ skipping 20 matching lines @@
 //   - No nested loops can be run, and all tasks are run non-nested.
 //   - Work scheduled via libdispatch runs at the same priority as and is
 //     interleaved with posted tasks, though FIFO order is guaranteed.
 //
 class BASE_EXPORT LibDispatchTaskRunner : public base::SingleThreadTaskRunner {
  public:
   // Starts a new serial dispatch queue with a given name.
   explicit LibDispatchTaskRunner(const char* name);
 
   // base::TaskRunner:
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const Closure& task,
-                               base::TimeDelta delay) OVERRIDE;
-  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const Closure& task,
+                       base::TimeDelta delay) override;
+  bool RunsTasksOnCurrentThread() const override;
 
   // base::SequencedTaskRunner:
-  virtual bool PostNonNestableDelayedTask(
-      const tracked_objects::Location& from_here,
-      const Closure& task,
-      base::TimeDelta delay) OVERRIDE;
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const Closure& task,
+                                  base::TimeDelta delay) override;
 
   // This blocks the calling thread until all work on the dispatch queue has
   // been run and the queue has been destroyed. Destroying a queue requires
   // ALL retained references to it to be released. Any new tasks posted to
   // this thread after shutdown are dropped.
   void Shutdown();
 
   // Returns the dispatch queue associated with this task runner, for use with
   // system APIs that take dispatch queues. The caller is responsible for
   // retaining the result.
@@ skipping 11 matching lines @@
   dispatch_queue_t queue_;
 
   // The event on which Shutdown waits until Finalizer runs.
   base::WaitableEvent queue_finalized_;
 };
 
 }  // namespace mac
 }  // namespace base
 
 #endif  // BASE_MAC_LIBDISPATCH_SEQUENCED_TASK_RUNNER_H_