cros: Remove get user info code from OAuth2LoginManager

chrome/browser/chromeos/login/signin/oauth2_login_verifier.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_LOGIN_VERIFIER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_LOGIN_VERIFIER_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 45 matching lines @@
   void OnAddAccountToCookieCompleted(
       const std::string& account_id,
       const GoogleServiceAuthError& error) override;
   void OnGaiaAccountsInCookieUpdated(
       const std::vector<gaia::ListedAccount>& accounts,
       const std::vector<gaia::ListedAccount>& signed_out_accounts,
       const GoogleServiceAuthError& error) override;
 
   OAuth2LoginVerifier::Delegate* delegate_;
   GaiaCookieManagerService* cookie_manager_service_;
-  const std::string& primary_account_id_;
+  const std::string primary_account_id_;
   const std::string access_token_;
 
   DISALLOW_COPY_AND_ASSIGN(OAuth2LoginVerifier);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_OAUTH2_LOGIN_VERIFIER_H_