Standardize usage of virtual/override/final specifiers.

chrome/browser/metrics/thread_watcher_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <math.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 283 matching lines @@
   void WaitForSetUp(TimeDelta wait_time) {
     DCHECK(!WatchDogThread::CurrentlyOnWatchDogThread());
     TimeTicks end_time = TimeTicks::Now() + wait_time;
     {
       base::AutoLock auto_lock(lock_);
       while (!initialized_ && TimeTicks::Now() < end_time)
         setup_complete_.TimedWait(end_time - TimeTicks::Now());
     }
   }
 
-  virtual ~ThreadWatcherTest() {
+  ~ThreadWatcherTest() override {
     ThreadWatcherList::DeleteAll();
     io_watcher_ = NULL;
     db_watcher_ = NULL;
     io_thread_.reset();
     db_thread_.reset();
     watchdog_thread_.reset();
     thread_watcher_list_ = NULL;
   }
 
  private:
@@ skipping 414 matching lines @@
       FROM_HERE,
       message_loop_for_ui.QuitClosure(),
       base::TimeDelta::FromSeconds(
           ThreadWatcherList::g_initialize_delay_seconds));
   message_loop_for_ui.Run();
 
   CheckState(false /* has_thread_watcher_list */,
              true /* stopped */,
              "Stopped");
 }