Backed out changeset 4f95cfe243f3 (bug 1405696) for leaks detected by Linux x64 asan. r=backout on a CLOSED TREE

--HG--
extra : amend_source : 8c7df425b2848018cfac28fef815366d8c60b8ed

dom/xhr/XMLHttpRequestMainThread.cpp

@@ -1550,14 +1550,8 @@ XMLHttpRequestMainThread::Open(const nsACString& aMethod,
   } else if (responsibleDocument) {
     baseURI = responsibleDocument->GetBaseURI();
   }
-
-  NotNull<const Encoding*> originCharset = UTF_8_ENCODING;
-  if (responsibleDocument) {
-    originCharset = responsibleDocument->GetDocumentCharacterSet();
-  }
-
   nsCOMPtr<nsIURI> parsedURL;
-  rv = NS_NewURI(getter_AddRefs(parsedURL), aUrl, originCharset, baseURI);
+  rv = NS_NewURI(getter_AddRefs(parsedURL), aUrl, nullptr, baseURI);
   if (NS_FAILED(rv)) {
     if (rv ==  NS_ERROR_MALFORMED_URI) {
       return NS_ERROR_DOM_MALFORMED_URI;

testing/web-platform/meta/XMLHttpRequest/open-url-encoding.htm.ini

@@ -1,6 +0,0 @@
-[open-url-encoding.htm]
-  type: testharness
-  [lone surrogate]
-    expected: FAIL
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1410139
-

testing/web-platform/tests/XMLHttpRequest/open-url-encoding.htm

@@ -14,14 +14,14 @@
         var client = new XMLHttpRequest()
         client.open("GET", "resources/content.py?\u00DF", false) // This is the German "eszett" character
         client.send()
-        assert_equals(client.getResponseHeader("x-request-query"), "%DF")
+        assert_equals(client.getResponseHeader("x-request-query"), "%C3%9F")
       }, "percent encode characters");
       test(function() {
         var client = new XMLHttpRequest()
         client.open("GET", "resources/content.py?\uD83D", false)
         client.send()
-        assert_equals(client.getResponseHeader("x-request-query"), "%26%2355357%3B")
-      }, "lone surrogate");
+        assert_equals(client.getResponseHeader("x-request-query"), "%EF%BF%BD")
+      }, "lone surrogate should return U+FFFD");
     </script>
   </body>
 </html>