Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/drive.

chrome/browser/chromeos/drive/download_handler.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 "chrome/browser/chromeos/drive/download_handler.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/supports_user_data.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 15 matching lines @@
 namespace {
 
 // Key for base::SupportsUserData::Data.
 const char kDrivePathKey[] = "DrivePath";
 
 // User Data stored in DownloadItem for drive path.
 class DriveUserData : public base::SupportsUserData::Data {
  public:
   explicit DriveUserData(const base::FilePath& path) : file_path_(path),
                                                        is_complete_(false) {}
-  virtual ~DriveUserData() {}
+  ~DriveUserData() override {}
 
   const base::FilePath& file_path() const { return file_path_; }
   const base::FilePath& cache_file_path() const { return cache_file_path_; }
   void set_cache_file_path(const base::FilePath& path) {
     cache_file_path_ = path;
   }
   bool is_complete() const { return is_complete_; }
   void set_complete() { is_complete_ = true; }
 
  private:
@@ skipping 286 matching lines @@
 
 DownloadManager* DownloadHandler::GetDownloadManager(void* manager_id) {
   if (manager_id == notifier_->GetManager())
     return notifier_->GetManager();
   if (notifier_incognito_ && manager_id == notifier_incognito_->GetManager())
     return notifier_incognito_->GetManager();
   return NULL;
 }
 
 }  // namespace drive