Update {virtual,override} to follow C++11 style in chrome.

chrome/renderer/translate/translate_helper_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/time/time.h"
 #include "chrome/renderer/isolated_world_ids.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 #include "components/translate/content/common/translate_messages.h"
 #include "components/translate/content/renderer/translate_helper.h"
 #include "components/translate/core/common/translate_constants.h"
@@ skipping 10 matching lines @@
 
 class TestTranslateHelper : public translate::TranslateHelper {
  public:
   explicit TestTranslateHelper(content::RenderView* render_view)
       : translate::TranslateHelper(
             render_view,
             chrome::ISOLATED_WORLD_ID_TRANSLATE,
             extensions::EXTENSION_GROUP_INTERNAL_TRANSLATE_SCRIPTS,
             extensions::kExtensionScheme) {}
 
-  virtual base::TimeDelta AdjustDelay(int delayInMs) override {
+  base::TimeDelta AdjustDelay(int delayInMs) override {
     // Just returns base::TimeDelta() which has initial value 0.
     // Tasks doesn't need to be delayed in tests.
     return base::TimeDelta();
   }
 
   void TranslatePage(const std::string& source_lang,
                      const std::string& target_lang,
                      const std::string& translate_script) {
     OnTranslatePage(0, translate_script, source_lang, target_lang);
   }
@@ skipping 421 matching lines @@
 
   GoBack(back_state);
 
   message = render_thread_->sink().GetUniqueMessageMatching(
       ChromeViewHostMsg_TranslateLanguageDetermined::ID);
   ASSERT_NE(static_cast<IPC::Message*>(NULL), message);
   ChromeViewHostMsg_TranslateLanguageDetermined::Read(message, &params);
   EXPECT_EQ("zh", get<0>(params).adopted_language);
   render_thread_->sink().ClearMessages();
 }