Have content/ create and destroy its own threads.

chrome/browser/policy/config_dir_policy_provider_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/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/json/json_value_serializer.h"
+#include "base/message_loop.h"
 #include "base/scoped_temp_dir.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/policy/config_dir_policy_provider.h"
 #include "chrome/browser/policy/configuration_policy_provider_test.h"
 
 namespace policy {
 
 namespace {
 
@@ skipping 145 matching lines @@
   for (unsigned int i = 5; i <= 8; ++i)
     harness_.WriteConfigFile(test_dict_bar, base::IntToString(i));
 
   ConfigDirPolicyProviderDelegate loader(harness_.test_dir());
   scoped_ptr<base::DictionaryValue> policy(loader.Load());
   EXPECT_TRUE(policy.get());
   EXPECT_TRUE(policy->Equals(&test_dict_foo));
 }
 
 }  // namespace policy