Make ExtensionInstallPrompt::Prompt ref-counted

chrome/browser/extensions/webstore_startup_installer.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/webstore_startup_installer.h"
 
 namespace extensions {
 
 WebstoreStartupInstaller::WebstoreStartupInstaller(
     const std::string& webstore_item_id,
     Profile* profile,
     bool show_prompt,
     const Callback& callback)
     : WebstoreInstallWithPrompt(webstore_item_id, profile, callback),
       show_prompt_(show_prompt) {
   set_install_source(WebstoreInstaller::INSTALL_SOURCE_INLINE);
 }
 
 WebstoreStartupInstaller::~WebstoreStartupInstaller() {}
 
-scoped_ptr<ExtensionInstallPrompt::Prompt>
+scoped_refptr<ExtensionInstallPrompt::Prompt>
 WebstoreStartupInstaller::CreateInstallPrompt() const {
-  scoped_ptr<ExtensionInstallPrompt::Prompt> prompt;
   if (show_prompt_) {
-    prompt.reset(new ExtensionInstallPrompt::Prompt(
-        ExtensionInstallPrompt::INSTALL_PROMPT));
+    return new ExtensionInstallPrompt::Prompt(
+        ExtensionInstallPrompt::INSTALL_PROMPT);
   }
-  return prompt.Pass();
+  return NULL;
 }
 
 }  // namespace extensions