[Sync] Remove dependencies on BrowserThread from sync

chrome/browser/sync/notifier/sync_notifier_factory.cc

Index: chrome/browser/sync/notifier/sync_notifier_factory.cc
diff --git a/chrome/browser/sync/notifier/sync_notifier_factory.cc b/chrome/browser/sync/notifier/sync_notifier_factory.cc
index 9542f5fc327d45ed6397bab6ee64cd18dbaabac0..c5bf289210ba71a7330df2114b9d1ee0c9d89b2a 100644
--- a/chrome/browser/sync/notifier/sync_notifier_factory.cc
+++ b/chrome/browser/sync/notifier/sync_notifier_factory.cc
@@ -14,15 +14,12 @@
 #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 {
 
@@ -132,11 +129,9 @@ SyncNotifierFactory::SyncNotifierFactory(
           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() {