ServiceWorker: Update IDLs to use ScalarValueString

LayoutTests/http/tests/serviceworker/resources/request-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/request-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/request-worker.js b/LayoutTests/http/tests/serviceworker/resources/request-worker.js
index ef41a3a327d090748a1012b8968e16d26c826e8e..34629f9ecfebf2d884901bc20cad299bf7dfdc1b 100644
--- a/LayoutTests/http/tests/serviceworker/resources/request-worker.js
+++ b/LayoutTests/http/tests/serviceworker/resources/request-worker.js
@@ -22,6 +22,10 @@ test(function() {
 
     request.url = 'http://localhost/';
     assert_equals(request.url, 'http://localhost/', 'Request.url should be writable');
+    request.url = 'http://localhost/\uD800'; // Unmatched lead surrogate.
+    assert_equals(request.url,
+                  'http://localhost/' + encodeURIComponent('\uFFFD'),
+                  'Request.url should have unmatched surrogates replaced.');
     request.method = 'POST';
     assert_equals(request.method, 'POST', 'Request.method should be writable');
     assert_throws({name: 'TypeError'}, function() { request.method = 'invalid \u0100'; },