SimpleCache: Fix race condition in simple_index_file_unittest

net/disk_cache/simple/simple_index_file_unittest.cc

 // Copyright (c) 2011 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.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/hash.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 274 matching lines @@
   EXPECT_EQ(net::OK, cb.GetResult(rv));
   rv = simple_cache->index()->ExecuteWhenReady(cb.callback());
   EXPECT_EQ(net::OK, cb.GetResult(rv));
   delete simple_cache;
 
   // The backend flushes the index on destruction and does so on the cache
   // thread, wait for the flushing to finish by posting a callback to the cache
   // thread after that.
   MessageLoopHelper helper;
   CallbackTest cb_shutdown(&helper, false);
-  cache_thread.task_runner()->PostTask(
-      FROM_HERE,
+  cache_thread.task_runner()->PostTaskAndReply(
+      FROM_HERE, base::Bind(&base::DoNothing),
       base::Bind(&CallbackTest::Run, base::Unretained(&cb_shutdown), net::OK));
   helper.WaitUntilCacheIoFinished(1);
 
   // Verify that the index file exists.
   const base::FilePath& index_file_path =
       cache_path.AppendASCII("index-dir").AppendASCII("the-real-index");
   EXPECT_TRUE(base::PathExists(index_file_path));
 
   // Verify that the version of the index file is correct.
   std::string contents;
@@ skipping 32 matching lines @@
   closure.WaitForResult();
 
   // Check that the temporary file was deleted and the index file was created.
   EXPECT_FALSE(base::PathExists(simple_index_file.GetTempIndexFilePath()));
   EXPECT_TRUE(base::PathExists(simple_index_file.GetIndexFilePath()));
 }
 
 #endif  // defined(OS_POSIX)
 
 }  // namespace disk_cache