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

chrome/browser/download/chrome_download_manager_delegate_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/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
@@ skipping 23 matching lines @@
 using ::testing::ReturnRefOfCopy;
 using ::testing::SetArgPointee;
 using ::testing::WithArg;
 using ::testing::_;
 using content::DownloadItem;
 
 namespace {
 
 class MockWebContentsDelegate : public content::WebContentsDelegate {
  public:
-  virtual ~MockWebContentsDelegate() {}
+  ~MockWebContentsDelegate() 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 337 matching lines @@
       CreateActiveDownloadItem(1));
   EXPECT_CALL(*download_item, GetTargetFilePath())
       .WillRepeatedly(ReturnRef(existing_path));
   EXPECT_TRUE(CheckForFileExistence(download_item.get()));
 
   download_item.reset(CreateActiveDownloadItem(1));
   EXPECT_CALL(*download_item, GetTargetFilePath())
       .WillRepeatedly(ReturnRef(non_existent_path));
   EXPECT_FALSE(CheckForFileExistence(download_item.get()));
 }