old_contents: from google.appengine.api import users
  from model import User
  
  def get_current_user_model():
      return get_youtify_user_model_for(users.get_current_user())
  
  def get_user_model_for(google_user=None):
      return User.all().filter('google_user =', google_user).get()
new_contents: from google.appengine.api import users
  from model import User
  
  def get_current_user_model():
      return get_user_model_for(users.get_current_user())
  
  def get_user_model_for(google_user=None):
      return User.all().filter('google_user =', google_user).get()
subject: Fix bug in utils