Rename 'ScalarValueString' to 'USVString' to match Web IDL

Source/modules/serviceworkers/CacheStorage.idl

Index: Source/modules/serviceworkers/CacheStorage.idl
diff --git a/Source/modules/serviceworkers/CacheStorage.idl b/Source/modules/serviceworkers/CacheStorage.idl
index 50c4c5f1a9a7b872df506774c0d668786ffd9d62..2c45a36616d330e527308da7f4e451bba4a7e9f9 100644
--- a/Source/modules/serviceworkers/CacheStorage.idl
+++ b/Source/modules/serviceworkers/CacheStorage.idl
@@ -8,9 +8,9 @@
     Exposed=ServiceWorker,
     RuntimeEnabled=ServiceWorkerCache,
 ] interface CacheStorage {
-  [CallWith=ScriptState] Promise has(ScalarValueString cacheName);
-  [CallWith=ScriptState] Promise open(ScalarValueString cacheName);
-  [CallWith=ScriptState, ImplementedAs=deleteFunction] Promise delete(ScalarValueString cacheName);
+  [CallWith=ScriptState] Promise has(USVString cacheName);
+  [CallWith=ScriptState] Promise open(USVString cacheName);
+  [CallWith=ScriptState, ImplementedAs=deleteFunction] Promise delete(USVString cacheName);
   [CallWith=ScriptState] Promise keys();
   // FIXME: From https://github.com/slightlyoff/ServiceWorker/issues/372 and the updated
   // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#cache-storage ,