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

chrome/browser/history/in_memory_url_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 <algorithm>
 #include <fstream>
 
 #include "base/auto_reset.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 168 matching lines @@
       history_service_, row, url_index_->languages_,
       url_index_->scheme_whitelist_);
 }
 
 bool InMemoryURLIndexTest::DeleteURL(const GURL& url) {
   return GetPrivateData()->DeleteURL(url);
 }
 
 void InMemoryURLIndexTest::SetUp() {
   // We cannot access the database until the backend has been loaded.
-  profile_.CreateHistoryService(true, false);
+  ASSERT_TRUE(profile_.CreateHistoryService(true, false));
   profile_.CreateBookmarkModel(true);
   ui_test_utils::WaitForBookmarkModelToLoad(&profile_);
   profile_.BlockUntilHistoryProcessesPendingRequests();
   profile_.BlockUntilHistoryIndexIsRefreshed();
   history_service_ = HistoryServiceFactory::GetForProfile(
       &profile_, Profile::EXPLICIT_ACCESS);
   ASSERT_TRUE(history_service_);
   HistoryBackend* backend = history_service_->history_backend_.get();
   history_database_ = backend->db();
 
@@ skipping 970 matching lines @@
   full_file_path.GetComponents(&actual_parts);
   ASSERT_EQ(expected_parts.size(), actual_parts.size());
   size_t count = expected_parts.size();
   for (size_t i = 0; i < count; ++i)
     EXPECT_EQ(expected_parts[i], actual_parts[i]);
   // Must clear the history_dir_ to satisfy the dtor's DCHECK.
   set_history_dir(base::FilePath());
 }
 
 }  // namespace history