Bootstrap: after r38409 and r38410, revert r38402 which reverted r38399.

This fixes the paths in `wp-vendor/` that were including `src`. I want to drop this in so we can find out what else will break.

See #36335.


git-svn-id: https://develop.svn.wordpress.org/trunk@38411 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-http.php

@@ -7,7 +7,7 @@
  * @since 2.7.0
  */
 
-if ( ! class_exists( 'Requests' ) ) {
+if ( ! class_exists( 'Requests', false ) ) {
 	require( ABSPATH . WPINC . '/class-requests.php' );
 
 	Requests::register_autoloader();