Don't trigger a link resource fetch on media change.

third_party/WebKit/LayoutTests/http/tests/resources/network-simulator.php

 <?php
 require_once 'portabilityLayer.php';
 
 // This script acts as a stateful proxy for retrieving files. When the state is set to
 // offline, it simulates a network error with a nonsense response.
 
 if (!sys_get_temp_dir()) {
     echo "FAIL: No temp dir was returned.\n";
     exit();
 }
@@ skipping 26 matching lines @@
     if (preg_match("/\.svg$/", $path))
         return "application/svg+xml";
     if (preg_match("/\.xsl$/", $path))
         return "application/xslt+xml";
     if (preg_match("/\.gif$/", $path))
         return "image/gif";
     if (preg_match("/\.jpg$/", $path))
         return "image/jpeg";
     if (preg_match("/\.png$/", $path))
         return "image/png";
+    if (preg_match("/\.css$/", $path))
+        return "text/css";
     return "text/plain";
 }
 
 function generateNoCacheHTTPHeader()
 {
     header("Expires: Thu, 01 Dec 2003 16:00:00 GMT");
     header("Cache-Control: no-cache, no-store, must-revalidate");
     header("Pragma: no-cache");
 }
 
@@ skipping 119 matching lines @@
     else if ($command == "log-resource-request")
         handleLogResourceRequest($_GET['path']);
     else
         echo "Unknown command: " . $command . "\n";
     exit();
 }
 
 $requestedPath = $_GET['path'];
 generateResponse($requestedPath);
 ?>