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

chrome/browser/views/options/content_page_view.cc

 // Copyright (c) 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/views/options/content_page_view.h"
 
 #include <windows.h>
 #include <shlobj.h>
 #include <vsstyle.h>
 #include <vssym32.h>
@@ skipping 124 matching lines @@
           this,
           l10n_util::GetString(IDS_SYNC_STOP_SYNCING_EXPLANATION_LABEL),
           l10n_util::GetString(IDS_SYNC_STOP_SYNCING_BUTTON_LABEL),
           l10n_util::GetString(IDS_SYNC_STOP_SYNCING_CONFIRM_BUTTON_LABEL),
           l10n_util::GetString(IDS_CANCEL),
           gfx::Size(views::Window::GetLocalizedContentsSize(
               IDS_CONFIRM_STOP_SYNCING_DIALOG_WIDTH_CHARS,
               IDS_CONFIRM_STOP_SYNCING_DIALOG_HEIGHT_LINES)));
       return;
     } else {
-      sync_service_->EnableForUser();
+      sync_service_->EnableForUser(GetWindow()->GetNativeWindow());
       ProfileSyncService::SyncEvent(ProfileSyncService::START_FROM_OPTIONS);
     }
 #endif
   }
 }
 
 void ContentPageView::LinkActivated(views::Link* source, int event_flags) {
   if (source == themes_gallery_link_) {
     UserMetricsRecordAction(L"Options_ThemesGallery", profile()->GetPrefs());
     BrowserList::GetLastActive()->OpenURL(
         GURL(l10n_util::GetString(IDS_THEMES_GALLERY_URL)),
         GURL(), NEW_FOREGROUND_TAB, PageTransition::LINK);
     return;
   }
 #ifdef CHROME_PERSONALIZATION
   DCHECK_EQ(source, sync_action_link_);
   DCHECK(sync_service_);
-  sync_service_->ShowLoginDialog();
+  sync_service_->ShowLoginDialog(GetWindow()->GetNativeWindow());
 #endif
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ContentPageView, OptionsPageView implementation:
 
 void ContentPageView::InitControlLayout() {
   using views::GridLayout;
   using views::ColumnSet;
 
@@ skipping 322 matching lines @@
   if (status_has_error) {
     sync_status_label_->set_background(CreateErrorBackground());
     sync_action_link_->set_background(CreateErrorBackground());
   } else {
     sync_status_label_->set_background(NULL);
     sync_action_link_->set_background(NULL);
   }
 }
 
 #endif