Have content/ create and destroy its own threads.

chrome/browser/sync/sync_prefs_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 "chrome/browser/sync/sync_prefs.h"
 
+#include "base/message_loop.h"
 #include "base/time.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 #include "chrome/test/base/testing_pref_service.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace browser_sync {
 
 namespace {
 
@@ skipping 207 matching lines @@
   const syncable::ModelTypeSet& non_passive_types = GetNonPassiveTypes();
   EXPECT_TRUE(sync_prefs.GetPreferredDataTypes(non_passive_types).empty());
   EXPECT_FALSE(sync_prefs.IsManaged());
   EXPECT_TRUE(sync_prefs.GetEncryptionBootstrapToken().empty());
   EXPECT_TRUE(sync_prefs.GetAllMaxVersions().empty());
 }
 
 }  // namespace
 
 }  // namespace browser_sync