Upstream service wrkr "iframe sandbox" test to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/iframe-register-link-element.html b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html
similarity index 56%
rename from third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/iframe-register-link-element.html
rename to third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html
index 1247fe2c2d476055571674c63c060c089236d5e6..db5bf230e89cd886110ba974037ffcaa3b372f70 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/iframe-register-link-element.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html
@@ -1,12 +1,16 @@
 <script>
+'use strict';
 var link = document.createElement('link');
 link.setAttribute('rel', 'serviceworker');
 link.setAttribute('href', 'empty-worker.js');
+function report(result) {
+    top.postMessage({id: location.search, result: result}, '*');
+};
 link.onload = function() {
-    top.postMessage('loaded', '*');
-}
-link.onerror = function(e) {
-    top.postMessage('error', '*');
-}
+    report('loaded');
+};
+link.onerror = function() {
+    report('error');
+};
 document.getElementsByTagName('head')[0].appendChild(link);
 </script>