Minor history tweaks that I came across while looking at crashes.

chrome/browser/history/history_service_factory.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/history/history_service_factory.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/history/chrome_history_client.h"
 #include "chrome/browser/history/chrome_history_client_factory.h"
@@ skipping 51 matching lines @@
           "HistoryService", BrowserContextDependencyManager::GetInstance()) {
   DependsOn(ChromeHistoryClientFactory::GetInstance());
 }
 
 HistoryServiceFactory::~HistoryServiceFactory() {
 }
 
 KeyedService* HistoryServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
-  HistoryService* history_service = new HistoryService(
-      ChromeHistoryClientFactory::GetForProfile(profile), profile);
-  if (!history_service->Init(profile->GetPath())) {
+  scoped_ptr<HistoryService> history_service(new HistoryService(
+      ChromeHistoryClientFactory::GetForProfile(profile), profile));
+  if (!history_service->Init(profile->GetPath()))
     return NULL;
-  }
-  return history_service;
+  return history_service.release();
 }
 
 content::BrowserContext* HistoryServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 bool HistoryServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }