Standardize usage of virtual/override/final specifiers.

chrome/browser/errorpage_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/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 275 matching lines @@
 }
 
 class ErrorPageTest : public InProcessBrowserTest {
  public:
   enum HistoryNavigationDirection {
     HISTORY_NAVIGATE_BACK,
     HISTORY_NAVIGATE_FORWARD,
   };
 
   ErrorPageTest() : link_doctor_interceptor_(NULL) {}
-  virtual ~ErrorPageTest() {}
+  ~ErrorPageTest() override {}
 
   // Navigates the active tab to a mock url created for the file at |file_path|.
   // Needed for StaleCacheStatus and StaleCacheStatusFailedCorrections tests.
   void SetUpCommandLine(CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kEnableOfflineLoadStaleCache);
   }
 
   // Navigates the active tab to a mock url created for the file at |file_path|.
   void NavigateToFileURL(const base::FilePath::StringType& file_path) {
     ui_test_utils::NavigateToURL(
@@ skipping 791 matching lines @@
       browser(),
       URLRequestFailedJob::GetMockHttpUrlForHostname(net::ERR_UNSAFE_PORT,
                                                      kHostname),
       1);
 
   ToggleHelpBox(browser());
   EXPECT_TRUE(IsDisplayingText(browser(), kHostnameJSUnicode));
 }
 
 }  // namespace