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

chrome/browser/importer/profile_writer_unittest.cc

 // Copyright 2013 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 <string>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
@@ skipping 176 matching lines @@
 
   profile_writer->AddBookmarks(bookmarks_,
                                ASCIIToUTF16("Imported from Firefox"));
   // Verify that duplicate bookmarks exist.
   VerifyBookmarksCount(bookmarks_record, bookmark_model, 2);
 }
 
 // Verify that history entires are not duplicated when added twice.
 TEST_F(ProfileWriterTest, CheckHistoryAfterWritingDataTwice) {
   TestingProfile profile;
-  profile.CreateHistoryService(true, false);
+  ASSERT_TRUE(profile.CreateHistoryService(true, false));
   profile.BlockUntilHistoryProcessesPendingRequests();
 
   CreateHistoryPageEntries();
   scoped_refptr<TestProfileWriter> profile_writer(
       new TestProfileWriter(&profile));
   profile_writer->AddHistoryPage(pages_, history::SOURCE_FIREFOX_IMPORTED);
   VerifyHistoryCount(&profile);
   size_t original_history_count = history_count_;
   history_count_ = 0;
 
   profile_writer->AddHistoryPage(pages_, history::SOURCE_FIREFOX_IMPORTED);
   VerifyHistoryCount(&profile);
   EXPECT_EQ(original_history_count, history_count_);
 }