Make application shortcuts point to app_host.exe, install App Host during app installation.

chrome/browser/extensions/app_shortcut_manager.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_APP_SHORTCUT_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_SHORTCUT_MANAGER_H_
 
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 18 matching lines @@
                              const std::string& extension_id,
                              int index) OVERRIDE;
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   void UpdateApplicationShortcuts(const Extension* extension);
+
+#if defined(OS_WIN)
+  void OnAppHostInstallationComplete(const Extension* extension,
+                                     bool app_host_install_success);
+#endif
+
   void DeleteApplicationShortcuts(const Extension* extension);
 
   content::NotificationRegistrar registrar_;
   Profile* profile_;
 
   // Fields used when installing application shortcuts.
   ShellIntegration::ShortcutInfo shortcut_info_;
   ImageLoadingTracker tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(AppShortcutManager);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_SHORTCUT_MANAGER_H_