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

chrome/browser/download/download_target_determiner_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 "base/at_exit.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_service.h"
@@ skipping 44 matching lines @@
 using ::testing::WithArg;
 using ::testing::_;
 using content::DownloadItem;
 
 namespace {
 
 // No-op delegate.
 class NullWebContentsDelegate : public content::WebContentsDelegate {
  public:
   NullWebContentsDelegate() {}
-  virtual ~NullWebContentsDelegate() {}
+  ~NullWebContentsDelegate() override {}
 };
 
 // Google Mock action that posts a task to the current message loop that invokes
 // the first argument of the mocked method as a callback. Said argument must be
 // a base::Callback<void(ParamType)>. |result| must be of |ParamType| and is
 // bound as that parameter.
 // Example:
 //   class FooClass {
 //    public:
 //     virtual void Foo(base::Callback<void(bool)> callback);
@@ skipping 2106 matching lines @@
   EXPECT_CALL(mock_plugin_filter_, MockPluginAvailable(npapi_plugin.path()))
       .WillRepeatedly(Return(true));
 
   target_info = RunDownloadTargetDeterminer(
       GetPathInDownloadDir(kInitialPath), item.get());
   EXPECT_FALSE(target_info->is_filetype_handled_safely);
 }
 #endif  // defined(ENABLE_PLUGINS)
 
 }  // namespace