[Sync] Propagate XMPP auth errors to SyncNotifierObservers

sync/notifier/push_client_channel.h

Index: sync/notifier/push_client_channel.h
diff --git a/sync/notifier/push_client_channel.h b/sync/notifier/push_client_channel.h
index 1721def63fc16bdb42968b7970facfb97aa75117..d7ce4d397f0f738642b29c95e288ec5a17b91f1c 100644
--- a/sync/notifier/push_client_channel.h
+++ b/sync/notifier/push_client_channel.h
@@ -27,6 +27,8 @@ class PushClientChannel
     : public invalidation::NetworkChannel,
       public notifier::PushClientObserver {
  public:
+  // |push_client| is guaranteed to be destroyed only when this object
+  // |is destroyed.
   explicit PushClientChannel(scoped_ptr<notifier::PushClient> push_client);
 
   virtual ~PushClientChannel();
@@ -46,7 +48,8 @@ class PushClientChannel
       invalidation::SystemResources* resources) OVERRIDE;
 
   // notifier::PushClient::Observer implementation.
-  virtual void OnNotificationStateChange(bool notifications_enabled) OVERRIDE;
+  virtual void OnPushClientStateChange(
+      notifier::PushClientState push_client_state) OVERRIDE;
   virtual void OnIncomingNotification(
       const notifier::Notification& notification) OVERRIDE;