Standardize usage of virtual/override/final in chrome/browser/download/

chrome/browser/download/download_item_model.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/download/download_item_model.h"
 
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string16.h"
@@ skipping 47 matching lines @@
   // Whether the download should be opened in the browser vs. the system handler
   // for the file type.
   bool should_prefer_opening_in_browser_;
 
   // Whether the download should be considered dangerous if SafeBrowsing doesn't
   // come up with a verdict.
   bool is_dangerous_file_based_on_type_;
 
  private:
   DownloadItemModelData();
-  virtual ~DownloadItemModelData() {}
+  ~DownloadItemModelData() override {}
 
   static const char kKey[];
 };
 
 // static
 const char DownloadItemModelData::kKey[] = "DownloadItemModelData key";
 
 // static
 const DownloadItemModelData* DownloadItemModelData::Get(
     const DownloadItem* download) {
@@ skipping 614 matching lines @@
   if (!download_service)
     return;
 
   ChromeDownloadManagerDelegate* delegate =
       download_service->GetDownloadManagerDelegate();
   if (!delegate)
     return;
   delegate->OpenDownloadUsingPlatformHandler(download_);
   RecordDownloadOpenMethod(DOWNLOAD_OPEN_METHOD_USER_PLATFORM);
 }