Bug 1867680 - update StorageEvent url to be a USVString as per spec; r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D208070

dom/events/test/test_dom_storage_event.html

@@ -28,7 +28,7 @@ const kTests = [
 
   { createEventArg: "storageEvent",
     type: "ddd", bubbles: false, cancelable: false,
-    key: 'key', oldValue: 'a', newValue: 'b', url: null, storageArea: null },
+    key: 'key', oldValue: 'a', newValue: 'b', url: '', storageArea: null },
 
   { createEventArg: "StorageEvent",
     type: "eee", bubbles: true, cancelable: true,
@@ -36,7 +36,7 @@ const kTests = [
 
   { createEventArg: "storageevent",
     type: "fff", bubbles: false, cancelable: true,
-    key: null, oldValue: null, newValue: null, url: null, storageArea: null },
+    key: null, oldValue: null, newValue: null, url: '', storageArea: null },
   ];
 
 for (var i = 0; i < kTests.length; i++) {

dom/webidl/StorageEvent.webidl

@@ -18,17 +18,16 @@ interface StorageEvent : Event
   readonly attribute DOMString? key;
   readonly attribute DOMString? oldValue;
   readonly attribute DOMString? newValue;
-  readonly attribute DOMString? url;
+  readonly attribute USVString url;
   readonly attribute Storage? storageArea;
 
-  // Bug 1016053 - This is not spec compliant.
   undefined initStorageEvent(DOMString type,
                              optional boolean canBubble = false,
                              optional boolean cancelable = false,
                              optional DOMString? key = null,
                              optional DOMString? oldValue = null,
                              optional DOMString? newValue = null,
-                             optional DOMString? url = null,
+                             optional USVString url = "",
                              optional Storage? storageArea = null);
 };
 
@@ -37,6 +36,6 @@ dictionary StorageEventInit : EventInit
   DOMString? key = null;
   DOMString? oldValue = null;
   DOMString? newValue = null;
-  DOMString url = "";
+  USVString url = "";
   Storage? storageArea = null;
 };

testing/web-platform/meta/html/dom/usvstring-reflection.https.html.ini

@@ -10,9 +10,6 @@
   [area : unpaired surrogate codepoint should be replaced with U+FFFD]
     expected: FAIL
 
-  [storage event : unpaired surrogate codepoint should be replaced with U+FFFD]
-    expected: FAIL
-
   [UnregisterProtocolHandler URL: unpaired surrogate codepoint should not make any exceptions.]
     expected: FAIL
 

testing/web-platform/meta/webstorage/event_initstorageevent.window.js.ini

@@ -1,11 +1,3 @@
 [event_initstorageevent.window.html]
   expected:
     if (os == "android") and fission: [OK, TIMEOUT]
-  [initStorageEvent with 1 argument]
-    expected: FAIL
-
-  [initStorageEvent with 8 null arguments]
-    expected: FAIL
-
-  [initStorageEvent with 8 undefined arguments]
-    expected: FAIL