[Sync] Remove dependencies on BrowserThread from sync

chrome/browser/sync/notifier/sync_notifier_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_NOTIFIER_SYNC_NOTIFIER_FACTORY_H_
 #define CHROME_BROWSER_SYNC_NOTIFIER_SYNC_NOTIFIER_FACTORY_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/sync/notifier/invalidation_version_tracker.h"
 #include "chrome/browser/sync/util/weak_handle.h"
 
 class CommandLine;
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace sync_notifier {
 
 class SyncNotifier;
 
 // Class to instantiate various implementations of the SyncNotifier
-// interface.  Must be created/destroyed on the UI thread.
+// interface.
 class SyncNotifierFactory {
  public:
   // |client_info| is a string identifying the client, e.g. a user
   // agent string.  |invalidation_version_tracker| may be NULL (for
   // tests).
   SyncNotifierFactory(
       const std::string& client_info,
       const scoped_refptr<net::URLRequestContextGetter>&
           request_context_getter,
       const base::WeakPtr<InvalidationVersionTracker>&
@@ skipping 11 matching lines @@
   const scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   const InvalidationVersionMap initial_max_invalidation_versions_;
   const browser_sync::WeakHandle<InvalidationVersionTracker>
       invalidation_version_tracker_;
   const CommandLine& command_line_;
 };
 
 }  // namespace sync_notifier
 
 #endif  // CHROME_BROWSER_SYNC_NOTIFIER_SYNC_NOTIFIER_FACTORY_H_