Move tests for sendBeacon to a separate dedicated directory for clearer ownership

third_party/WebKit/LayoutTests/http/tests/navigation/resources/save-beacon.php

-<?php
-require_once '../../resources/portabilityLayer.php';
-
-function prettify($name) {
-   return str_replace(' ', '-', ucwords(str_replace('_', ' ', str_replace('http_', '', strtolower($name)))));
-}
-
-$beaconFilename = sys_get_temp_dir() . "/beacon" . (isset($_REQUEST['name']) ? $_REQUEST['name'] : "") . ".txt";
-$beaconFile = fopen($beaconFilename . ".tmp", 'w');
-$httpHeaders = $_SERVER;
-ksort($httpHeaders, SORT_STRING);
-$contentType = "";
-foreach ($httpHeaders as $name => $value) {
-    if ($name === "CONTENT_TYPE" || $name === "HTTP_REFERER" || $name === "REQUEST_METHOD" || $name === "HTTP_COOKIE" || $name === "HTTP_ORIGIN") {
-        if ($name === "CONTENT_TYPE") {
-            $contentType = $value;
-            $value = preg_replace('/boundary=.*$/', '', $value);
-        }
-        $headerName = prettify($name);
-        fwrite($beaconFile, "$headerName: $value\n");
-    }
-}
-$postdata = file_get_contents("php://input");
-if (strlen($postdata) == 0)
-   $postdata = http_build_query($_POST);
-
-fwrite($beaconFile, "Length: " . strlen($postdata) . "\n");
-if (strpos($contentType, "application/") !== false) {
-    $postdata = base64_encode($postdata);
-}
-
-fwrite($beaconFile, "Body: $postdata\n");
-fclose($beaconFile);
-rename($beaconFilename . ".tmp", $beaconFilename);
-
-if (!array_key_exists('dontclearcookies', $_GET)) {
-  foreach ($_COOKIE as $name => $value)
-      setcookie($name, "deleted", time() - 60, "/");
-}
-?>