Standardize usage of virtual/override/final specifiers.

chrome/browser/printing/print_preview_pdf_generated_browsertest.cc

 // Copyright 2014 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 <algorithm>
 #include <fstream>
 #include <iostream>
 #include <iterator>
 #include <limits>
 #include <string>
@@ skipping 281 matching lines @@
   State state_;
   std::string failed_setting_;
   const base::FilePath pdf_file_save_path_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewObserver);
 };
 
 class PrintPreviewPdfGeneratedBrowserTest : public InProcessBrowserTest {
  public:
   PrintPreviewPdfGeneratedBrowserTest() {}
-  virtual ~PrintPreviewPdfGeneratedBrowserTest() {}
+  ~PrintPreviewPdfGeneratedBrowserTest() override {}
 
   // Navigates to the given web page, then initiates print preview and waits
   // for all the settings to be set, then save the preview to PDF.
   void NavigateAndPrint(const base::FilePath::StringType& file_name,
                           const PrintPreviewSettings& settings) {
     print_preview_observer_->SetPrintPreviewSettings(settings);
     base::FilePath path(file_name);
     GURL gurl = net::FilePathToFileURL(path);
 
     ui_test_utils::NavigateToURL(browser(), gurl);
@@ skipping 380 matching lines @@
     // waiting for this message and start waiting for the image data.
     std::cout << "#EOF\n";
     std::cout.flush();
 
     SendPng();
     Reset();
   }
 }
 
 }  // namespace printing