Updated SigninManager and TokenService to generate notifications at signout.

chrome/browser/sync/profile_sync_service.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/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 513 matching lines @@
 void ProfileSyncService::DisableForUser() {
   // Clear prefs (including SyncSetupHasCompleted) before shutting down so
   // PSS clients don't think we're set up while we're shutting down.
   sync_prefs_.ClearPreferences();
   ClearUnrecoverableError();
   ShutdownImpl(true);
 
   // 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();
 }
 
 bool ProfileSyncService::HasSyncSetupCompleted() const {
   return sync_prefs_.HasSyncSetupCompleted();
 }
 
 void ProfileSyncService::SetSyncSetupCompleted() {
@@ skipping 1132 matching lines @@
   // See http://stackoverflow.com/questions/6224121/is-new-this-myclass-undefined-behaviour-after-directly-calling-the-destru.
   ProfileSyncService* old_this = this;
   this->~ProfileSyncService();
   new(old_this) ProfileSyncService(
       new ProfileSyncComponentsFactoryImpl(profile,
                                            CommandLine::ForCurrentProcess()),
       profile,
       signin,
       behavior);
 }