Add asserts to TestingProfile::CreateHistoryService to ensure files are deleted

chrome/browser/bookmarks/bookmark_index_unittest.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/bookmarks/bookmark_index.h"
 
 #include <string>
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 218 matching lines @@
   EXPECT_TRUE(matches[0].node == n1);
   EXPECT_TRUE(matches[0].match_positions.empty());
 }
 
 TEST_F(BookmarkIndexTest, GetResultsSortedByTypedCount) {
   // This ensures MessageLoop::current() will exist, which is needed by
   // TestingProfile::BlockUntilHistoryProcessesPendingRequests().
   content::TestBrowserThreadBundle thread_bundle;
 
   TestingProfile profile;
-  profile.CreateHistoryService(true, false);
+  ASSERT_TRUE(profile.CreateHistoryService(true, false));
   profile.BlockUntilHistoryProcessesPendingRequests();
   profile.CreateBookmarkModel(true);
 
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(&profile);
   ui_test_utils::WaitForBookmarkModelToLoad(model);
 
   HistoryService* const history_service =
       HistoryServiceFactory::GetForProfile(&profile, Profile::EXPLICIT_ACCESS);
 
   history::URLDatabase* url_db = history_service->InMemoryDatabase();
@@ skipping 53 matching lines @@
   EXPECT_EQ(data[1].url, matches[3].node->url());
 
   matches.clear();
   // Select top two matches.
   model->GetBookmarksWithTitlesMatching(ASCIIToUTF16("google"), 2, &matches);
 
   EXPECT_EQ(2, static_cast<int>(matches.size()));
   EXPECT_EQ(data[0].url, matches[0].node->url());
   EXPECT_EQ(data[3].url, matches[1].node->url());
 }