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

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/switches.h"
 #include "base/auto_reset.h"
 #include "base/callback.h"
@@ skipping 106 matching lines @@
 
   void Wait() {
     if (observed_)
       return;
 
     run_loop_.reset(new base::RunLoop);
     run_loop_->Run();
   }
 
   // AppShimHandler overrides:
-  virtual void OnShimLaunch(Host* host,
-                            apps::AppShimLaunchType launch_type,
-                            const std::vector<base::FilePath>& files) override {
+  void OnShimLaunch(Host* host,
+                    apps::AppShimLaunchType launch_type,
+                    const std::vector<base::FilePath>& files) override {
     // Remove self and pass through to the default handler.
     apps::AppShimHandler::RemoveHandler(app_mode_id_);
     apps::AppShimHandler::GetForAppMode(app_mode_id_)
         ->OnShimLaunch(host, launch_type, files);
     observed_ = true;
     if (run_loop_.get())
       run_loop_->Quit();
   }
-  virtual void OnShimClose(Host* host) override {}
-  virtual void OnShimFocus(Host* host,
-                           apps::AppShimFocusType focus_type,
-                           const std::vector<base::FilePath>& files) override {}
-  virtual void OnShimSetHidden(Host* host, bool hidden) override {}
-  virtual void OnShimQuit(Host* host) override {}
+  void OnShimClose(Host* host) override {}
+  void OnShimFocus(Host* host,
+                   apps::AppShimFocusType focus_type,
+                   const std::vector<base::FilePath>& files) override {}
+  void OnShimSetHidden(Host* host, bool hidden) override {}
+  void OnShimQuit(Host* host) override {}
 
  private:
   std::string app_mode_id_;
   bool observed_;
   scoped_ptr<base::RunLoop> run_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowedAppShimLaunchObserver);
 };
 
 NSString* GetBundleID(const base::FilePath& shim_path) {
@@ skipping 244 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