Standardize usage of virtual/override/final in cc/

cc/test/ordered_simple_task_runner.h

Index: cc/test/ordered_simple_task_runner.h
diff --git a/cc/test/ordered_simple_task_runner.h b/cc/test/ordered_simple_task_runner.h
index ee80efe7e71a21ce67e29b750ca76129368f24cb..7f63113e52d812cde186c12a9722d14b83e26a35 100644
--- a/cc/test/ordered_simple_task_runner.h
+++ b/cc/test/ordered_simple_task_runner.h
@@ -53,15 +53,14 @@ class OrderedSimpleTaskRunner : public base::SingleThreadTaskRunner {
                           bool advance_now);
 
   // base::TestSimpleTaskRunner implementation:
-  virtual 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;
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override;
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const base::Closure& task,
+                                  base::TimeDelta delay) override;
 
-  virtual bool RunsTasksOnCurrentThread() const override;
+  bool RunsTasksOnCurrentThread() const override;
 
   // Set a maximum number of tasks to run at once. Useful as a timeout to
   // prevent infinite task loops.
@@ -133,7 +132,7 @@ class OrderedSimpleTaskRunner : public base::SingleThreadTaskRunner {
   bool NowBeforeCallback(base::TimeTicks stop_at);
   bool AdvanceNowCallback();
 
-  virtual ~OrderedSimpleTaskRunner();
+  ~OrderedSimpleTaskRunner() override;
 
   base::ThreadChecker thread_checker_;