Standardize usage of virtual/override/final in media/

media/cast/test/fake_single_thread_task_runner.h

Index: media/cast/test/fake_single_thread_task_runner.h
diff --git a/media/cast/test/fake_single_thread_task_runner.h b/media/cast/test/fake_single_thread_task_runner.h
index 8392e4a95cddd2e163094cd4a4db906816d10439..60aaae47749f59db24a4f98158d0234646f17d20 100644
--- a/media/cast/test/fake_single_thread_task_runner.h
+++ b/media/cast/test/fake_single_thread_task_runner.h
@@ -28,20 +28,19 @@ class FakeSingleThreadTaskRunner : public base::SingleThreadTaskRunner {
   void Sleep(base::TimeDelta t);
 
   // base::SingleThreadTaskRunner implementation.
-  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 RunsTasksOnCurrentThread() const override;
+  bool RunsTasksOnCurrentThread() const override;
 
   // This function is currently not used, and will return false.
-  virtual bool PostNonNestableDelayedTask(
-      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;
 
  protected:
-  virtual ~FakeSingleThreadTaskRunner();
+  ~FakeSingleThreadTaskRunner() override;
 
  private:
   base::SimpleTestTickClock* const clock_;