Make ExtensionInstallPrompt::Prompt ref-counted

chrome/browser/extensions/webstore_standalone_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_standalone_installer.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
@@ skipping 307 matching lines @@
           localized_name_,
           localized_description_,
           &error);
   if (!localized_extension_for_display_.get()) {
     CompleteInstall(kInvalidManifestError);
     return;
   }
 
   install_ui_ = CreateInstallUI();
   install_ui_->ConfirmStandaloneInstall(
-      this, localized_extension_for_display_.get(), &icon_, *install_prompt_);
+      this, localized_extension_for_display_.get(), &icon_, install_prompt_);
 }
 
 void WebstoreStandaloneInstaller::OnWebStoreDataFetcherDone() {
   // An instance of this class is passed in as a delegate for the
   // WebstoreInstallHelper, ExtensionInstallPrompt and WebstoreInstaller, and
   // therefore needs to remain alive until they are done. Clear the webstore
   // data fetcher to avoid calling Release in AbortInstall while any of these
   // operations are in progress.
   webstore_data_fetcher_.reset();
 }
 
 }  // namespace extensions