Update {virtual,override,final} for chrome/ to follow C++11 style.

chrome/browser/apps/app_shim/app_shim_interactive_uitest_mac.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 
 #include "apps/app_lifetime_monitor_factory.h"
 #include "apps/switches.h"
 #include "base/auto_reset.h"
@@ skipping 145 matching lines @@
 };
 
 // Watches for a hosted app browser window to open.
 class HostedAppBrowserListObserver : public chrome::BrowserListObserver {
  public:
   explicit HostedAppBrowserListObserver(const std::string& app_id)
       : app_id_(app_id), observed_add_(false), observed_removed_(false) {
     BrowserList::AddObserver(this);
   }
 
-  ~HostedAppBrowserListObserver() { BrowserList::RemoveObserver(this); }
+  ~HostedAppBrowserListObserver() override {
+    BrowserList::RemoveObserver(this);
+  }
 
   void WaitUntilAdded() {
     if (observed_add_)
       return;
 
     run_loop_.reset(new base::RunLoop);
     run_loop_->Run();
   }
 
   void WaitUntilRemoved() {
@@ skipping 33 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(HostedAppBrowserListObserver);
 };
 
 class AppLifetimeMonitorObserver : public apps::AppLifetimeMonitor::Observer {
  public:
   AppLifetimeMonitorObserver(Profile* profile)
       : profile_(profile), activated_count_(0), deactivated_count_(0) {
     apps::AppLifetimeMonitorFactory::GetForProfile(profile_)->AddObserver(this);
   }
-  virtual ~AppLifetimeMonitorObserver() {
+  ~AppLifetimeMonitorObserver() override {
     apps::AppLifetimeMonitorFactory::GetForProfile(profile_)
         ->RemoveObserver(this);
   }
 
   int activated_count() { return activated_count_; }
   int deactivated_count() { return deactivated_count_; }
 
  protected:
   // AppLifetimeMonitor::Observer overrides:
   void OnAppActivated(Profile* profile, const std::string& app_id) override {
@@ skipping 475 matching lines @@
   // the shim is rebuilt.
   WindowedAppShimLaunchObserver(app->id()).Wait();
 
   EXPECT_TRUE(GetFirstAppWindow());
   EXPECT_TRUE(HasAppShimHost(profile(), app->id()));
 }
 
 #endif  // defined(ARCH_CPU_64_BITS)
 
 }  // namespace apps