Standardize usage of virtual/override/final in content/

content/child/worker_thread_task_runner.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_CHILD_WORKER_THREAD_TASK_RUNNER_H_
 #define CONTENT_CHILD_WORKER_THREAD_TASK_RUNNER_H_
 
 #include "base/task_runner.h"
 
 namespace content {
 
 // A task runner that runs tasks on a single webkit worker thread which
 // is managed by WorkerTaskRunner.
 // Note that this implementation ignores the delay duration for PostDelayedTask
 // and have it behave the same as PostTask.
 class WorkerThreadTaskRunner : public base::TaskRunner {
  public:
   explicit WorkerThreadTaskRunner(int worker_thread_id);
 
   // Gets the WorkerThreadTaskRunner for the current worker thread.
   // This returns non-null value only when it is called on a worker thread.
   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_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WORKER_THREAD_TASK_RUNNER_H_