Standardize usage of virtual/override/final in mojo/

mojo/apps/js/standalone_main.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 "base/files/file_util.h"
 #include "base/i18n/icu_util.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/apps/js/application_delegate_impl.h"
 #include "mojo/apps/js/js_app.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 
 namespace mojo {
 namespace apps {
 
 class StandaloneJSApp : public JSApp {
  public:
   StandaloneJSApp(ApplicationDelegateImpl* app_delegate_impl,
                   const base::FilePath& path)
       : JSApp(app_delegate_impl),
         path_(path) {
   }
 
-  virtual bool Load(std::string* source, std::string* file_name) override {
+  bool Load(std::string* source, std::string* file_name) override {
     *file_name = path_.AsUTF8Unsafe();
     return ReadFileToString(path_, source);
   }
 
  private:
   base::FilePath path_;
 };
 
 class StandaloneApplicationDelegateImpl : public ApplicationDelegateImpl {
  private:
-  virtual void Initialize(ApplicationImpl* app) override {
+  void Initialize(ApplicationImpl* app) override {
     base::i18n::InitializeICU();
     ApplicationDelegateImpl::Initialize(app);
 
     for (size_t i = 1; i < app->args().size(); i++) {
       base::FilePath path(base::FilePath::FromUTF8Unsafe(app->args()[i]));
       scoped_ptr<JSApp> js_app(new StandaloneJSApp(this, path));
       StartJSApp(js_app.Pass());
     }
   }
 };
 
 }  // namespace apps
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(
       new mojo::apps::StandaloneApplicationDelegateImpl());
   return runner.Run(shell_handle);
 }