Remove global state for redirect_url

boot.php

@@ -526,7 +526,6 @@ class App {
 	private $curl_code;
 	private $curl_content_type;
 	private $curl_headers;
-	private $curl_redirect_url;
 
 	private $cached_profile_image;
 	private $cached_profile_picdate;
@@ -910,14 +909,6 @@ class App {
 		return $this->curl_headers;
 	}
 
-	function set_curl_redirect_url($url) {
-		$this->curl_redirect_url = $url;
-	}
-
-	function get_curl_redirect_url() {
-		return $this->curl_redirect_url;
-	}
-
 	function get_cached_avatar_image($avatar_image){
 		return $avatar_image;