[Sync] Remove dependencies on BrowserThread from sync

chrome/browser/sync/notifier/sync_notifier_factory.cc

 // 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.
 
 #include "chrome/browser/sync/notifier/sync_notifier_factory.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "chrome/browser/sync/notifier/non_blocking_invalidation_notifier.h"
 #include "chrome/browser/sync/notifier/p2p_notifier.h"
 #include "chrome/browser/sync/notifier/sync_notifier.h"
 #include "chrome/common/chrome_switches.h"
-#include "content/public/browser/browser_thread.h"
 #include "jingle/notifier/base/const_communicator.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "jingle/notifier/listener/mediator_thread_impl.h"
 #include "jingle/notifier/listener/talk_mediator_impl.h"
 #include "net/base/host_port_pair.h"
 
-using content::BrowserThread;
-
 namespace sync_notifier {
 namespace {
 
 // TODO(akalin): Figure out whether this should be a method of
 // HostPortPair.
 net::HostPortPair StringToHostPortPair(const std::string& host_port_str,
                                        uint16 default_port) {
   std::string::size_type colon_index = host_port_str.find(':');
   if (colon_index == std::string::npos) {
     return net::HostPortPair(host_port_str, default_port);
@@ skipping 89 matching lines @@
         invalidation_version_tracker,
     const CommandLine& command_line)
     : client_info_(client_info),
       request_context_getter_(request_context_getter),
       initial_max_invalidation_versions_(
           invalidation_version_tracker.get() ?
           invalidation_version_tracker->GetAllMaxVersions() :
           InvalidationVersionMap()),
       invalidation_version_tracker_(invalidation_version_tracker),
       command_line_(command_line) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 SyncNotifierFactory::~SyncNotifierFactory() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 SyncNotifier* SyncNotifierFactory::CreateSyncNotifier() {
   return CreateDefaultSyncNotifier(command_line_,
                                    request_context_getter_,
                                    initial_max_invalidation_versions_,
                                    invalidation_version_tracker_,
                                    client_info_);
 }
 }  // namespace sync_notifier