Updated SigninManager and TokenService to generate notifications at signout.

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index 7ad73734f1988f50da35cbbf6d41d8071995195a..4ddaf6dadf56327a41c5bfd2935a018733d8450b 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -534,7 +534,7 @@ void ProfileSyncService::DisableForUser() {
   // TODO(atwilson): Don't call SignOut() on *any* platform - move this into
   // the UI layer if needed (sync activity should never result in the user
   // being logged out of all chrome services).
-  if (!auto_start_enabled_)
+  if (!auto_start_enabled_ && !signin_->GetAuthenticatedUsername().empty())
     signin_->SignOut();
 
   NotifyObservers();