Avoid decoding XHR type="json" responses as UTF-16BE/LE

https://infra.spec.whatwg.org/#parse-json-from-bytes says to use "UTF-8 decode" rather than "decode", so UTF-16BE/LE BOM should not be honored. Upstreamed from servo/servo#19096 [ci skip]
web-platform-tests · Nov 15, 2017 · 678d58c · 678d58c
1 parent 32ea1aa
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diff --git a/XMLHttpRequest/no-utf16-json.htm b/XMLHttpRequest/no-utf16-json.htm
@@ -0,0 +1,19 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>XMLHttpRequest: responseType "json" should be decoded as UTF-8 even when there's a UTF-16 BOM</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://infra.spec.whatwg.org/#parse-json-from-bytes" data-tested-assertations="following::ol/li[1]" />
+<div id="log"></div>
+
+<script>
+  async_test(function() {
+    var client = new XMLHttpRequest();
+    client.responseType = 'json';
+    client.onload = this.step_func_done(function(e) {
+      assert_equals(client.response, null);
+    });
+    client.open("GET", "resources/utf16-bom.json");
+    client.send(null);
+  }, 'JSON asa UTF-16 with BOM should decode as UTF-8 (and, therefore, fail)');
+</script>
diff --git a/XMLHttpRequest/resources/utf16-bom.json b/XMLHttpRequest/resources/utf16-bom.json