Remove tests related to `wp_*_post_meta()` functions.

These tests functions were introduced as part of the attempt to straighten out
metadata slashing. See [23416]. The functions were later pulled out [23554],
but the tests were not removed at the same time. Since that point, they've
done nothing, so they can safely be removed.

See #21767. See #36016.
Built from https://develop.svn.wordpress.org/trunk@36787


git-svn-id: http://core.svn.wordpress.org/trunk@36754 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-beta1-36786';
+$wp_version = '4.5-beta1-36787';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.