Fix crash in extension NavigationObserver

chrome/browser/extensions/navigation_observer.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/navigation_observer.h"
 
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 73 matching lines @@
   ExtensionService* extension_service = profile_->GetExtensionService();
   const Extension* extension = extension_service->GetExtensionById(
       in_progress_prompt_extension_id_, true);
   NavigationController* nav_controller =
       in_progress_prompt_navigation_controller_;
   CHECK(extension);
   CHECK(nav_controller);
 
   in_progress_prompt_extension_id_ = "";
   in_progress_prompt_navigation_controller_ = NULL;
+  bool record_oauth2_grant = extension_install_prompt_->record_oauth2_grant();
   extension_install_prompt_.reset();
 
   // Grant permissions, re-enable the extension, and then reload the tab.
   extension_service->GrantPermissionsAndEnableExtension(
-      extension, extension_install_prompt_->record_oauth2_grant());
+      extension, record_oauth2_grant);
   nav_controller->Reload(true);
 }
 
 void NavigationObserver::InstallUIAbort(bool user_initiated) {
   ExtensionService* extension_service = profile_->GetExtensionService();
   const Extension* extension = extension_service->GetExtensionById(
       in_progress_prompt_extension_id_, true);
 
   in_progress_prompt_extension_id_ = "";
   in_progress_prompt_navigation_controller_ = NULL;
   extension_install_prompt_.reset();
 
   std::string histogram_name = user_initiated ?
       "Extensions.Permissions_ReEnableCancel" :
       "Extensions.Permissions_ReEnableAbort";
   ExtensionService::RecordPermissionMessagesHistogram(
       extension, histogram_name.c_str());
 }
 
 }  // namespace extensions