Index: wp-includes/SimplePie/HTTP/Parser.php
===================================================================
--- wp-includes/SimplePie/HTTP/Parser.php	(revision 55130)
+++ wp-includes/SimplePie/HTTP/Parser.php	(working copy)
@@ -483,7 +483,7 @@
 			}
 
 			$chunk_length = strlen($matches[0]);
-			$decoded .= $part = substr($encoded, $chunk_length, $length);
+			$decoded .= substr($encoded, $chunk_length, $length);
 			$encoded = substr($encoded, $chunk_length + $length + 2);
 
 			if (trim($encoded) === '0' || empty($encoded))
Index: wp-includes/SimplePie/Locator.php
===================================================================
--- wp-includes/SimplePie/Locator.php	(revision 55130)
+++ wp-includes/SimplePie/Locator.php	(working copy)
@@ -413,9 +413,7 @@
 			if (preg_match('/(feed|rss|rdf|atom|xml)/i', $value))
 			{
 				$this->checked_feeds++;
-				$headers = array(
-					'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
-				);
+				
 				$feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent, $this->force_fsockopen, $this->curl_options));
 				if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
 				{