Standardize usage of virtual/override/final specifiers.

content/browser/battery_status/battery_status_browsertest.cc

 // Copyright 2014 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 "base/command_line.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/battery_status/battery_status_manager.h"
 #include "content/browser/battery_status/battery_status_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
@@ skipping 70 matching lines @@
   }
 
   void SetUpOnIOThread() {
     battery_service_ = BatteryStatusService::GetInstance();
     battery_manager_ = new FakeBatteryManager(
         battery_service_->GetUpdateCallbackForTesting());
     battery_service_->SetBatteryManagerForTesting(battery_manager_);
     io_loop_finished_event_.Signal();
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     battery_service_->SetBatteryManagerForTesting(0);
   }
 
   FakeBatteryManager* battery_manager() {
     return battery_manager_;
   }
 
  private:
   FakeBatteryManager* battery_manager_;
   BatteryStatusService* battery_service_;
@@ skipping 54 matching lines @@
   battery_manager()->set_battery_status(status);
   battery_manager()->InvokeUpdateCallback();
   same_tab_observer2.Wait();
   EXPECT_EQ("pass", shell()->web_contents()->GetLastCommittedURL().ref());
   EXPECT_TRUE(battery_manager()->started());
 }
 
 }  //  namespace
 
 }  //  namespace content