Standardize usage of virtual/override/final in content/

content/child/worker_thread_task_runner.h

Index: content/child/worker_thread_task_runner.h
diff --git a/content/child/worker_thread_task_runner.h b/content/child/worker_thread_task_runner.h
index 2271793ef63b8d8e570ef877a4f4b20bfd0b2cd3..5acafbd81e5db0445d74f5ac17321bb8ad610e4e 100644
--- a/content/child/worker_thread_task_runner.h
+++ b/content/child/worker_thread_task_runner.h
@@ -22,13 +22,13 @@ class WorkerThreadTaskRunner : public base::TaskRunner {
   static scoped_refptr<WorkerThreadTaskRunner> current();
 
   // TaskRunner overrides.
-  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const base::Closure& task,
-                               base::TimeDelta delay) override;
-  virtual bool RunsTasksOnCurrentThread() const override;
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override;
+  bool RunsTasksOnCurrentThread() const override;
 
  protected:
-  virtual ~WorkerThreadTaskRunner();
+  ~WorkerThreadTaskRunner() override;
 
  private:
   const int worker_thread_id_;