[BackgroundFetch] Fix IDL parameter name for updateUI.

Change-Id: I229ea7ee210aa1a7abe3d7449294d2dcd24ce499
Reviewed-on: https://chromium-review.googlesource.com/1149921Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577901}

third_party/blink/renderer/modules/background_fetch/background_fetch_update_event.idl

@@ -10,5 +10,5 @@
     RuntimeEnabled=BackgroundFetch
 ]
 interface BackgroundFetchUpdateEvent : BackgroundFetchSettledEvent {
-    [CallWith=ScriptState] Promise<void> updateUI(BackgroundFetchUpdateUIOptions title);
+    [CallWith=ScriptState] Promise<void> updateUI(BackgroundFetchUpdateUIOptions options);
 };
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