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

chrome/browser/download/download_target_determiner_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 "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
@@ skipping 1069 matching lines @@
     },
   };
 
   // This test assumes that the danger level of .html files is
   // ALLOW_ON_USER_GESTURE.
   ASSERT_EQ(download_util::ALLOW_ON_USER_GESTURE,
             download_util::GetFileDangerLevel(
                 base::FilePath(FILE_PATH_LITERAL("foo.html"))));
 
   // First the history service must exist.
-  profile()->CreateHistoryService(false, false);
+  ASSERT_TRUE(profile()->CreateHistoryService(false, false));
 
   GURL url("http://visited.example.com/visited-link.html");
   // The time of visit is picked to be several seconds prior to the most recent
   // midnight.
   base::Time time_of_visit(
       base::Time::Now().LocalMidnight() - base::TimeDelta::FromSeconds(10));
   HistoryService* history_service =
       HistoryServiceFactory::GetForProfile(profile(), Profile::EXPLICIT_ACCESS);
   ASSERT_TRUE(history_service);
   history_service->AddPage(url, time_of_visit, history::SOURCE_BROWSED);
@@ skipping 770 matching lines @@
                                     GetPathInDownloadDir(kInitialPath),
                                     download_prefs(),
                                     delegate(),
                                     test_callback);
     run_loop.Run();
     ::testing::Mock::VerifyAndClearExpectations(delegate());
   }
 }
 
 }  // namespace