Add IsAuthenticated() method to SigninManager.

components/signin/core/browser/about_signin_internals.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 "components/signin/core/browser/about_signin_internals.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/hash.h"
 #include "base/i18n/time_formatting.h"
@@ skipping 147 matching lines @@
   client_->GetPrefs()->SetString(time_pref.c_str(), time_as_str);
 
   NotifyObservers();
 }
 
 void AboutSigninInternals::RefreshSigninPrefs() {
   // Since the AboutSigninInternals has a dependency on the SigninManager
   // (as seen in the AboutSigninInternalsFactory) the SigninManager can have
   // the AuthenticatedUsername set before AboutSigninInternals can observe it.
   // For that scenario, read the AuthenticatedUsername if it exists.
-  if (!signin_manager_->GetAuthenticatedUsername().empty()) {
+  if (signin_manager_->IsAuthenticated()) {
     signin_status_.untimed_signin_fields[USERNAME] =
         signin_manager_->GetAuthenticatedUsername();
   }
 
   // Return if no client exists. Can occur in unit tests.
   if (!client_)
     return;
 
   PrefService* pref_service = client_->GetPrefs();
   for (int i = UNTIMED_FIELDS_BEGIN; i < UNTIMED_FIELDS_END; ++i) {
@@ skipping 302 matching lines @@
     std::sort(it->second.begin(), it->second.end(), TokenInfo::LessThan);
     const std::vector<TokenInfo*>& tokens = it->second;
     for (size_t i = 0; i < tokens.size(); ++i) {
       base::DictionaryValue* token_info = tokens[i]->ToValue();
       token_details->Append(token_info);
     }
   }
 
   return signin_status.Pass();
 }