Do not clear tokens from db when the user enters new credentials.

chrome/browser/sync/signin_manager.h

 // Copyright (c) 2011 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.
 //
 // The signin manager encapsulates some functionality tracking
 // which user is signed in. When a user is signed in, a ClientLogin
 // request is run on their behalf. Auth tokens are fetched from Google
 // and the results are stored in the TokenService.
 
 #ifndef CHROME_BROWSER_SYNC_SIGNIN_MANAGER_H_
@@ skipping 63 matching lines @@
                            const std::string& login_captcha);
 
   // Used when a second factor access code was required to complete a signin
   // attempt.
   void ProvideSecondFactorAccessCode(const std::string& access_code);
 
   // Sign a user out, removing the preference, erasing all keys
   // associated with the user, and canceling all auth in progress.
   void SignOut();
 
+  // Called when a new request to re-authenticate a user is in progress.
+  // Will clear in memory data but leaves the db as such so when the browser
+  // restarts we can use the old token(which might throw a password error).
+  void ClearInMemoryData();
+
   // GaiaAuthConsumer
   virtual void OnClientLoginSuccess(const ClientLoginResult& result) OVERRIDE;
   virtual void OnClientLoginFailure(const GoogleServiceAuthError& error)
       OVERRIDE;
   virtual void OnGetUserInfoSuccess(const std::string& key,
                                     const std::string& value) OVERRIDE;
   virtual void OnGetUserInfoKeyNotFound(const std::string& key) OVERRIDE;
   virtual void OnGetUserInfoFailure(const GoogleServiceAuthError& error)
       OVERRIDE;
   virtual void OnTokenAuthFailure(const GoogleServiceAuthError& error)
@@ skipping 45 matching lines @@
   // Actual OAuth login handler.
   scoped_ptr<GaiaOAuthFetcher> oauth_login_;
 
   // Register for notifications from the TokenService.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManager);
 };
 
 #endif  // CHROME_BROWSER_SYNC_SIGNIN_MANAGER_H_