Have content/ create and destroy its own threads.

chrome/browser/sync/notifier/non_blocking_invalidation_notifier_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/notifier/non_blocking_invalidation_notifier.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
+#include "base/threading/thread.h"
 #include "chrome/browser/sync/notifier/invalidation_version_tracker.h"
 #include "chrome/browser/sync/notifier/mock_sync_notifier_observer.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 #include "chrome/browser/sync/syncable/model_type_payload_map.h"
 #include "chrome/browser/sync/util/weak_handle.h"
 #include "chrome/test/base/test_url_request_context_getter.h"
 #include "content/test/test_browser_thread.h"
 #include "jingle/notifier/base/fake_base_task.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 55 matching lines @@
   invalidation_notifier_->UpdateCredentials("foo@bar.com", "fake_token");
   invalidation_notifier_->UpdateEnabledTypes(types);
 }
 
 // TODO(akalin): Add synchronous operations for testing to
 // NonBlockingInvalidationNotifierTest and use that to test it.
 
 }  // namespace
 
 }  // namespace sync_notifier