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Updated interactive Widget tests to use WidgetAutoclosePtr

Interactive Widget tests now use WidgetAutoclosePtr where
applicable.

Bug: None
Change-Id: Ibf3e904585b1f25817e5e51a7a5d9e743679193a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148123
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758852}