Salesforce - Mass Update saleforce1 mobile field with APEX

Update_UserPreferencesHideS1BrowserUI

/**  
   *  Author: Hasantha Liyanage  
   * Created: 2014-12-15  
   * Summary: This will update the UserPreferencesHideS1BrowserUI field and make the Salesforce1 User  
   *       field on User object false  
   **/  
   // get the users who does not have salesforce1 mobile feature enabled  
   List<User> users = [  
     SELECT   
       Id,  
       IsActive,  
       UserPreferencesHideS1BrowserUI   
     FROM User   
     WHERE   
       IsActive = true   
     AND   
       UserPreferencesHideS1BrowserUI = false   
     ];  
   // make the users salesforce 1 mobile fetaure disabled individually  
   for(User user : users){  
     user.UserPreferencesHideS1BrowserUI = true;  
   }  
   update users;