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

base/test/null_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.
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/single_thread_task_runner.h"
 
 namespace base {
 
 // Helper class for tests that need to provide an implementation of a
 // *TaskRunner class but don't actually care about tasks being run.
 
 class NullTaskRunner : public base::SingleThreadTaskRunner {
  public:
   NullTaskRunner();
 
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const base::Closure& task,
-                               base::TimeDelta delay) OVERRIDE;
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override;
   virtual bool PostNonNestableDelayedTask(
       const tracked_objects::Location& from_here,
       const base::Closure& task,
-      base::TimeDelta delay) OVERRIDE;
+      base::TimeDelta delay) override;
   // Always returns true to avoid triggering DCHECKs.
-  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
+  bool RunsTasksOnCurrentThread() const override;
 
  protected:
   virtual ~NullTaskRunner();
 
   DISALLOW_COPY_AND_ASSIGN(NullTaskRunner);
 };
 
 }  // namespace