Remove no-longer-needed theme function wrappers

Over in #373201: Enhance drupal_render() themeing. Return renderable array on tracker page., we removed some theme functions that were originally meant as wrappers to other theme functions.

Close observers will note that we have been adding theme functions recently with our greater use drupal_render(). For example, theme_node_links() wraps theme_links(), theme_list() wraps theme_item_list(), etc. […] The reason why we did this is that drupal_render() always passes a single parameter to a theme function. So we needed to add a wrapper function to pass additional parameters.

That issue fixed the underlying problem with one parameter theme functions and drupal_render() and removed theme_node_links() theme_list(), but the other wrapping theme functions were not removed. And they should be removed.