Remove hard-coded origins in layout tests.

LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html

Index: LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html
diff --git a/LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html b/LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html
index 485128619eac80de5e646d78e4db9cd5d748002e..e096c149909ad8b3292a73acc2b799b6fb913134 100644
--- a/LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html
+++ b/LayoutTests/http/tests/serviceworker/resources/fetch-request-html-imports-iframe.html
@@ -1,2 +1,13 @@
-<link id="same" rel="import" href="http://127.0.0.1:8000/dummy-dir/same.html">
-<link id="other" rel="import" href="http://localhost:8000/dummy-dir/other.html">
+<script src="../../resources/get-host-info.js"></script>
+<script type="text/javascript">
+  var hostInfo = get_host_info();
+  var makeLink = function(id, url) {
+      var link = document.createElement('link');
+      link.rel = 'import'
+      link.id = id;
+      link.href = url;
+      document.documentElement.appendChild(link);
+    };
+  makeLink('same', hostInfo.HTTP_ORIGIN + '/dummy-dir/same.html');
+  makeLink('other', hostInfo.HTTP_REMOTE_ORIGIN + '/dummy-dir/other.html');
+</script>