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

base/deferred_sequenced_task_runner.h

Index: base/deferred_sequenced_task_runner.h
diff --git a/base/deferred_sequenced_task_runner.h b/base/deferred_sequenced_task_runner.h
index 00ab0507deff22d1c38e588b175a9c379a05fe94..29f5cca74b276c491bddd419acd623feef37122d 100644
--- a/base/deferred_sequenced_task_runner.h
+++ b/base/deferred_sequenced_task_runner.h
@@ -27,16 +27,15 @@ class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner {
       const scoped_refptr<SequencedTaskRunner>& target_runner);
 
   // TaskRunner implementation
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const Closure& task,
-                               TimeDelta delay) OVERRIDE;
-  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const Closure& task,
+                       TimeDelta delay) override;
+  bool RunsTasksOnCurrentThread() const override;
 
   // SequencedTaskRunner implementation
-  virtual bool PostNonNestableDelayedTask(
-      const tracked_objects::Location& from_here,
-      const Closure& task,
-      TimeDelta delay) OVERRIDE;
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const Closure& task,
+                                  TimeDelta delay) override;
 
   // Start the execution - posts all queued tasks to the target executor. The
   // deferred tasks are posted with their initial delay, meaning that the task