Convert Pass()→std::move() for CrOS extension code.

chrome/browser/extensions/api/webstore_widget_private/app_installer.cc

 // Copyright 2013 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/api/webstore_widget_private/app_installer.h"
 
 #include "base/macros.h"
 #include "chrome/common/extensions/webstore_install_result.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 49 matching lines @@
     const {
   if (silent_installation_)
     return nullptr;
 
   scoped_ptr<ExtensionInstallPrompt::Prompt> prompt(
       new ExtensionInstallPrompt::Prompt(
           ExtensionInstallPrompt::INLINE_INSTALL_PROMPT));
 
   prompt->SetWebstoreData(localized_user_count(), show_user_count(),
                           average_rating(), rating_count());
-  return prompt.Pass();
+  return prompt;
 }
 
 bool AppInstaller::ShouldShowPostInstallUI() const {
   return false;
 }
 
 bool AppInstaller::ShouldShowAppInstalledBubble() const {
   return false;
 }
 
@@ skipping 17 matching lines @@
   return true;
 }
 
 void AppInstaller::OnWebContentsDestroyed(content::WebContents* web_contents) {
   callback_.Run(false, kWebContentsDestroyedError,
                 extensions::webstore_install::OTHER_ERROR);
   AbortInstall();
 }
 
 }  // namespace webstore_widget