Stop creating shortcut for web apps when it is installing.

chrome/browser/ui/app_list/app_list_view_delegate.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/ui/app_list/app_list_view_delegate.h"
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 84 matching lines @@
 }
 
 void AppListViewDelegate::GetShortcutPathForApp(
     const std::string& app_id,
     const base::Callback<void(const base::FilePath&)>& callback) {
 #if defined(OS_WIN)
   ExtensionService* service = profile_->GetExtensionService();
   DCHECK(service);
   const extensions::Extension* extension =
       service->GetInstalledExtension(app_id);
-  DCHECK(extension);
+  if (!extension) {
+    // The installation of extension isn't finished yet.

[koz (OOO until 15th September), 2013/07/03 04:20:09]

This comment is unnecessary, could you remove it? (it's too specific - the
extension might not be there for any number of reasons).

[zhchbin, 2013/07/03 05:59:59]

Done.

+    callback.Run(base::FilePath());
+    return;
+  }
 
   base::FilePath app_data_dir(
       web_app::GetWebAppDataDirectory(profile_->GetPath(),
                                       extension->id(),
                                       GURL()));
 
   web_app::UpdateShortcutInfoAndIconForApp(
       *extension,
       profile_,
       base::Bind(CreateShortcutInWebAppDir, app_data_dir, callback));
@@ skipping 83 matching lines @@
 }
 
 void AppListViewDelegate::OpenFeedback() {
   chrome::HostDesktopType desktop = chrome::GetHostDesktopTypeForNativeWindow(
       controller_->GetAppListWindow());
   Browser* browser = chrome::FindOrCreateTabbedBrowser(
       profile_, desktop);
   chrome::ShowFeedbackPage(browser, std::string(),
                            chrome::kAppLauncherCategoryTag);
 }