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

chrome/browser/apps/app_shim/extension_app_shim_handler_mac.cc

 // Copyright 2013 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/apps/app_shim/extension_app_shim_handler_mac.h"
 
 #include "apps/app_lifetime_monitor_factory.h"
 #include "apps/launcher.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 74 matching lines @@
 class EnableViaPrompt : public ExtensionEnableFlowDelegate {
  public:
   EnableViaPrompt(Profile* profile,
                   const std::string& extension_id,
                   const base::Callback<void()>& callback)
       : profile_(profile),
         extension_id_(extension_id),
         callback_(callback) {
   }
 
-  virtual ~EnableViaPrompt() {
-  }
+  ~EnableViaPrompt() override {}
 
   void Run() {
     flow_.reset(new ExtensionEnableFlow(profile_, extension_id_, this));
     flow_->StartForCurrentlyNonexistentWindow(
         base::Callback<gfx::NativeWindow(void)>());
   }
 
  private:
   // ExtensionEnableFlowDelegate overrides.
-  virtual void ExtensionEnableFlowFinished() override {
+  void ExtensionEnableFlowFinished() override {
     callback_.Run();
     delete this;
   }
 
-  virtual void ExtensionEnableFlowAborted(bool user_initiated) override {
+  void ExtensionEnableFlowAborted(bool user_initiated) override {
     callback_.Run();
     delete this;
   }
 
   Profile* profile_;
   std::string extension_id_;
   base::Callback<void()> callback_;
   scoped_ptr<ExtensionEnableFlow> flow_;
 
   DISALLOW_COPY_AND_ASSIGN(EnableViaPrompt);
@@ skipping 426 matching lines @@
   if (hosts_.empty())
     delegate_->MaybeTerminate();
 }
 
 void ExtensionAppShimHandler::OnAppStop(Profile* profile,
                                         const std::string& app_id) {}
 
 void ExtensionAppShimHandler::OnChromeTerminating() {}
 
 }  // namespace apps