Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/webui/downloads_dom_handler_browsertest.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 "base/auto_reset.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/history/download_row.h"
@@ skipping 98 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MockDownloadsDOMHandler);
 };
 
 }  // namespace
 
 class DownloadsDOMHandlerTest : public InProcessBrowserTest {
  public:
   DownloadsDOMHandlerTest() {}
 
-  virtual ~DownloadsDOMHandlerTest() {}
+  ~DownloadsDOMHandlerTest() override {}
 
   void SetUpOnMainThread() override {
     mock_handler_.reset(new MockDownloadsDOMHandler(download_manager()));
     CHECK(downloads_directory_.CreateUniqueTempDir());
     browser()->profile()->GetPrefs()->SetFilePath(
         prefs::kDownloadDefaultDirectory,
         downloads_directory_.path());
     CHECK(test_server()->Start());
   }
 
@@ skipping 118 matching lines @@
 // TODO(benjhayden): Test incognito, both downloads_list() and that on-record
 // calls can't access off-record items.
 
 // TODO(benjhayden): Test that bad download ids incoming from the javascript are
 // dropped on the floor.
 
 // TODO(benjhayden): Test that IsTemporary() downloads are not shown.
 
 // TODO(benjhayden): Test that RemoveObserver is called on all download items,
 // including items that crossed IsTemporary() and back.