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

chrome/browser/extensions/app_shortcut_manager.h

Index: chrome/browser/extensions/app_shortcut_manager.h
diff --git a/chrome/browser/extensions/app_shortcut_manager.h b/chrome/browser/extensions/app_shortcut_manager.h
index bc78b24e953673bb06f1e8cf1804ce81aeaf0016..178fcae5c5b26e735c26935a60734d6c947a216b 100644
--- a/chrome/browser/extensions/app_shortcut_manager.h
+++ b/chrome/browser/extensions/app_shortcut_manager.h
@@ -36,6 +36,12 @@ class AppShortcutManager : public ImageLoadingTracker::Observer,
 
  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_;