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

chrome/browser/extensions/user_script_loader_unittest.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 "chrome/browser/extensions/user_script_loader.h"
 
 #include <set>
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 45 matching lines @@
         BrowserThread::FILE, base::MessageLoop::current()));
     ui_thread_.reset(new content::TestBrowserThread(
         BrowserThread::UI, base::MessageLoop::current()));
   }
 
   virtual void TearDown() {
     file_thread_.reset();
     ui_thread_.reset();
   }
 
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override {
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override {
     DCHECK(type == extensions::NOTIFICATION_USER_SCRIPTS_UPDATED);
 
     shared_memory_ = content::Details<base::SharedMemory>(details).ptr();
     if (base::MessageLoop::current() == &message_loop_)
       base::MessageLoop::current()->Quit();
   }
 
   // Directory containing user scripts.
   base::ScopedTempDir temp_dir_;
 
@@ skipping 177 matching lines @@
 
   UserScriptList user_scripts;
   user_scripts.push_back(user_script);
 
   UserScriptLoader::LoadScriptsForTest(&user_scripts);
 
   EXPECT_EQ(content, user_scripts[0].js_scripts()[0].GetContent().as_string());
 }
 
 }  // namespace extensions