Add IsAuthenticated() method to SigninManager.

chrome/browser/signin/signin_global_error.cc

 // Copyright (c) 2013 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/signin/signin_global_error.h"
 
 #include "base/logging.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_header_helper.h"
@@ skipping 106 matching lines @@
 base::string16 SigninGlobalError::GetBubbleViewTitle() {
   return l10n_util::GetStringUTF16(IDS_SIGNIN_ERROR_BUBBLE_VIEW_TITLE);
 }
 
 std::vector<base::string16> SigninGlobalError::GetBubbleViewMessages() {
   std::vector<base::string16> messages;
 
   // If the user isn't signed in, no need to display an error bubble.
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfileIfExists(profile_);
-  if (signin_manager) {
-    std::string username = signin_manager->GetAuthenticatedUsername();
-    if (username.empty())
+  if (signin_manager && !signin_manager->IsAuthenticated())
       return messages;
-  }
 
   if (!error_controller_->HasError())
     return messages;
 
   switch (error_controller_->auth_error().state()) {
     // TODO(rogerta): use account id in error messages.
 
     // User credentials are invalid (bad acct, etc).
     case GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS:
     case GoogleServiceAuthError::SERVICE_ERROR:
@@ skipping 40 matching lines @@
   ExecuteMenuItem(browser);
 }
 
 void SigninGlobalError::BubbleViewCancelButtonPressed(Browser* browser) {
   NOTREACHED();
 }
 
 void SigninGlobalError::OnErrorChanged() {
   GlobalErrorServiceFactory::GetForProfile(profile_)->NotifyErrorsChanged(this);
 }