Don't consider shutdown acknowledgement for external extensions

chrome/browser/extensions/external_install_ui.cc

 // 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.
 
 #include "chrome/browser/extensions/external_install_ui.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 322 matching lines @@
   const Extension* extension = NULL;
   if (service_weak_.get() &&
       (extension = service_weak_->GetInstalledExtension(extension_id_))) {
     service_weak_->GrantPermissionsAndEnableExtension(extension);
   }
   Release();
 }
 
 void ExternalInstallDialogDelegate::InstallUIAbort(bool user_initiated) {
   const Extension* extension = NULL;
-  if (service_weak_.get() &&
+
+  // Uninstall the extension if the abort was user initiated (and not, e.g., the
+  // result of the window closing).
+  // Otherwise, the extension will remain installed, but unacknowledged, so it
+  // will be prompted again.
+  if (user_initiated &&
+      service_weak_.get() &&
       (extension = service_weak_->GetInstalledExtension(extension_id_))) {
     service_weak_->UninstallExtension(extension_id_, false, NULL);
   }
   Release();
 }
 
 // ExternalInstallMenuAlert -------------------------------------------------
 
 ExternalInstallMenuAlert::ExternalInstallMenuAlert(ExtensionService* service,
                                                    const Extension* extension)
@@ skipping 220 matching lines @@
 
 bool HasExternalInstallBubble(ExtensionService* service) {
   GlobalErrorService* error_service =
       GlobalErrorServiceFactory::GetForProfile(service->profile());
   GlobalError* error = error_service->GetGlobalErrorByMenuItemCommandID(
       kMenuCommandId);
   return error && error->HasBubbleView();
 }
 
 }  // namespace extensions