Standardize usage of virtual/override/final specifiers.

chrome/browser/task_manager/task_manager_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 "chrome/browser/task_manager/task_manager.h"
 
 #include "base/files/file_path.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 46 matching lines @@
 
 namespace {
 
 const base::FilePath::CharType* kTitle1File = FILE_PATH_LITERAL("title1.html");
 
 }  // namespace
 
 class TaskManagerBrowserTest : public ExtensionBrowserTest {
  public:
   TaskManagerBrowserTest() {}
-  virtual ~TaskManagerBrowserTest() {}
+  ~TaskManagerBrowserTest() override {}
 
   TaskManagerModel* model() const {
     return TaskManager::GetInstance()->model();
   }
 
   void ShowTaskManager() {
     EXPECT_EQ(0, model()->ResourceCount());
 
     // Show the task manager. This populates the model, and helps with debugging
     // (you see the task manager).
@@ skipping 680 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, DevToolsOldUnockedWindow) {
   DevToolsWindow* devtools =
       DevToolsWindowTesting::OpenDevToolsWindowSync(browser(), false);
   ShowTaskManager();  // Task manager shown AFTER dev tools window.
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(3, MatchAnyTab()));
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(3, MatchAnyTab()));
   DevToolsWindowTesting::CloseDevToolsWindowSync(devtools);
 }