xhr: update test-suite to reflect use of XMLHttpRequestBodyInit

tests/wpt/metadata/MANIFEST.json

      ]
     ],
     "send-data-es-object.any.js": [
-     "c6fe5de260c212013052f66636b92fb07aa82373",
+     "92286bca6dd00b82b78de39fcf7988ba1c424d07",
      [
       "xhr/send-data-es-object.any.html",
       {
       }
      ]
     ],
-    "send-data-readablestream.any.js": [
-     "c53b1071828f95669d41a967c51bd352b389bebb",
-     [
-      "xhr/send-data-readablestream.any.html",
-      {
-       "script_metadata": [
-        [
-         "global",
-         "window,dedicatedworker,sharedworker"
-        ]
-       ]
-      }
-     ],
-     [
-      "xhr/send-data-readablestream.any.sharedworker.html",
-      {
-       "script_metadata": [
-        [
-         "global",
-         "window,dedicatedworker,sharedworker"
-        ]
-       ]
-      }
-     ],
-     [
-      "xhr/send-data-readablestream.any.worker.html",
-      {
-       "script_metadata": [
-        [
-         "global",
-         "window,dedicatedworker,sharedworker"
-        ]
-       ]
-      }
-     ]
-    ],
     "send-data-sharedarraybuffer.any.js": [
      "912f622697d538edbbc038f7ec76c2e63ee6ffa0",
      [
      ]
     ],
     "setrequestheader-content-type.htm": [
-     "8608c5967d6b29ba4f9d09ae7bf395a6b26876c2",
+     "07238391eb5cc8639edbe996208a18b6d9d26b04",
      [
       null,
       {

tests/wpt/web-platform-tests/xhr/send-data-es-object.any.js

@@ -27,6 +27,7 @@ function do_test(obj, expected, name) {
 do_test({}, '[object Object]', 'sending a plain empty object')
 do_test(Math, '[object Math]', 'sending the ES Math object')
 do_test(new XMLHttpRequest, '[object XMLHttpRequest]', 'sending a new XHR instance')
+do_test(new ReadableStream, '[object ReadableStream]', 'sending a new ReadableStream instance')
 do_test({toString:function(){}}, 'undefined', 'sending object that stringifies to undefined')
 do_test({toString:function(){return null}}, 'null', 'sending object that stringifies to null')
 var ancestor = {toString: function(){

tests/wpt/web-platform-tests/xhr/setrequestheader-content-type.htm

@@ -215,24 +215,6 @@
         // https://fetch.spec.whatwg.org/#bodyinit, so the user's must be changed to match it
         // as per https://xhr.spec.whatwg.org/#the-send%28%29-method step 4.
       )
-      request(
-        function _ReadableStream() { return new ReadableStream() },
-        {"Content-Type": ""},
-        "",
-        'ReadableStream request respects setRequestHeader("")'
-      )
-      request(
-        function _ReadableStream() { return new ReadableStream() },
-        {},
-        undefined,
-        "ReadableStream request with under type sends no Content-Type without setRequestHeader() call"
-      )
-      request(
-        function _ReadableStream() { return new ReadableStream() },
-        {"Content-Type": "application/xml;charset=ASCII"},
-        "application/xml;charset=ASCII",
-        "ReadableStream request keeps setRequestHeader() Content-Type and charset"
-      )
     </script>
   </body>
 </html>