Add IsAuthenticated() method to SigninManager.

chrome/browser/ui/chrome_pages.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/chrome_pages.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 293 matching lines @@
   content::RecordAction(UserMetricsAction("EditSearchEngines"));
   ShowSettingsSubPage(browser, kSearchEnginesSubPage);
 }
 
 void ShowBrowserSignin(Browser* browser, signin::Source source) {
   Profile* original_profile = browser->profile()->GetOriginalProfile();
   SigninManagerBase* manager =
       SigninManagerFactory::GetForProfile(original_profile);
   DCHECK(manager->IsSigninAllowed());
   // If we're signed in, just show settings.
-  if (!manager->GetAuthenticatedUsername().empty()) {
+  if (manager->IsAuthenticated()) {
     ShowSettings(browser);
   } else {
     // If the browser's profile is an incognito profile, make sure to use
     // a browser window from the original profile.  The user cannot sign in
     // from an incognito window.
     scoped_ptr<ScopedTabbedBrowserDisplayer> displayer;
     if (browser->profile()->IsOffTheRecord()) {
       displayer.reset(new ScopedTabbedBrowserDisplayer(
           original_profile, chrome::HOST_DESKTOP_TYPE_NATIVE));
       browser = displayer->browser();
     }
 
     NavigateToSingletonTab(browser, GURL(signin::GetPromoURL(source, false)));
     DCHECK_GT(browser->tab_strip_model()->count(), 0);
   }
 }
 
 }  // namespace chrome