Refactor LoginUIService to not rely on WebUI.

chrome/browser/ui/browser.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/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 2279 matching lines @@
     ShowOptionsTab(std::string());
   } else if (SyncPromoUI::ShouldShowSyncPromo(profile()) &&
              login_service->current_login_ui() == NULL) {
     // There is no currently active login UI, so display a new promo page.
     GURL url(SyncPromoUI::GetSyncPromoURL(GURL(), source));
     browser::NavigateParams params(GetSingletonTabNavigateParams(GURL(url)));
     params.path_behavior = browser::NavigateParams::IGNORE_AND_NAVIGATE;
     ShowSingletonTabOverwritingNTP(params);
   } else {
     LoginUIServiceFactory::GetForProfile(
-        profile()->GetOriginalProfile())->ShowLoginUI(false);
+        profile()->GetOriginalProfile())->ShowLoginUI();
   }
 }
 
 void Browser::ToggleSpeechInput() {
   GetSelectedWebContents()->GetRenderViewHost()->ToggleSpeechInput();
 }
 
 void Browser::UpdateDownloadShelfVisibility(bool visible) {
   if (GetStatusBubble())
     GetStatusBubble()->UpdateDownloadShelfVisibility(visible);
@@ skipping 3189 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }