Fix WPT for cross-partition blob URL navigation
When window.open is performed with 'noopener' a null handle is returned regardless of whether the navigation succeeded.
Bug: 359245744
Change-Id: I027e218b42936bdad5c0f4272f6a613978dc79de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5871987
Reviewed-by: Andrew Williams awillia@chromium.org
Commit-Queue: Kyra Seevers kyraseevers@chromium.org
Reviewed-by: Kyra Seevers kyraseevers@chromium.org
Auto-Submit: Janice Liu janiceliu@chromium.org
Cr-Commit-Position: refs/heads/main@{#1357219}