The login dialog was being opened with the main browser window as a parent in...

chrome/browser/browser.cc

 // Copyright (c) 2006-2009 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/browser.h"
 
 #include "app/animation.h"
 #include "app/l10n_util.h"
 #include "base/command_line.h"
 #include "base/keyboard_codes.h"
@@ skipping 1176 matching lines @@
 #ifdef CHROME_PERSONALIZATION
 void Browser::OpenSyncMyBookmarksDialog() {
   ProfileSyncService* service = profile_->GetProfileSyncService();
   // TODO(timsteele): Incognito has no sync service for the time being,
   // so protect against this case.
   if (!service)
     return;
   if (service->HasSyncSetupCompleted()) {
     ShowOptionsWindow(OPTIONS_PAGE_CONTENT, OPTIONS_GROUP_NONE, profile_);
   } else {
-    service->EnableForUser();
+    service->EnableForUser(NULL);
     ProfileSyncService::SyncEvent(ProfileSyncService::START_FROM_WRENCH);
   }
 }
 #endif
 
 void Browser::OpenAboutChromeDialog() {
   UserMetrics::RecordAction(L"AboutChrome", profile_);
   window_->ShowAboutChromeDialog();
 }
 
@@ skipping 1709 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 // BrowserToolbarModel (private):
 
 NavigationController* Browser::BrowserToolbarModel::GetNavigationController() {
   // This |current_tab| can be NULL during the initialization of the
   // toolbar during window creation (i.e. before any tabs have been added
   // to the window).
   TabContents* current_tab = browser_->GetSelectedTabContents();
   return current_tab ? &current_tab->controller() : NULL;
 }