Move sync notifier contruction out of syncer thread.

chrome/service/cloud_print/cloud_print_proxy_backend.cc

Index: chrome/service/cloud_print/cloud_print_proxy_backend.cc
diff --git a/chrome/service/cloud_print/cloud_print_proxy_backend.cc b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
index cbf55ee2860a82081df6a00bd212e9ecb27cc910..2268fc829b7aab757911e1e7e1c4d1fcb322c67e 100644
--- a/chrome/service/cloud_print/cloud_print_proxy_backend.cc
+++ b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
@@ -381,10 +381,11 @@ void CloudPrintProxyBackend::Core::DoInitializeWithToken(
     subscription.channel.append(proxy_id);
     subscription.from = kCloudPrintPushNotificationsSource;
     push_notifications_channel_ = subscription.channel;
-    talk_mediator_->AddSubscription(subscription);
     talk_mediator_->SetDelegate(this);
+    // SetAuthToken should be called before AddSubscription.
     talk_mediator_->SetAuthToken(email, cloud_print_xmpp_token,
                                  kSyncGaiaServiceId);
+    talk_mediator_->AddSubscription(subscription);
     talk_mediator_->Login();
 
     print_server_watcher_ = print_system_->CreatePrintServerWatcher();
@@ -449,6 +450,7 @@ void CloudPrintProxyBackend::Core::DoShutdown() {
     index->second->Shutdown();
   }
   // Important to delete the TalkMediator on this thread.
+  talk_mediator_->Logout();
   talk_mediator_.reset();
   notifications_enabled_ = false;
   notifications_enabled_since_ = base::TimeTicks();