[iOS] Manage close all/undo directly in the appropriate mediator Incognito and Regular page have different behavior when user tap on "Close All" button. This CL, separes functions and put it in their associated mediator and put `NOTREACHED_NORETURN()` in the base class. Bug: 1457146 Change-Id: I790732e7f038708434d12ba3476bcc962f256406 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4701084 Reviewed-by: Gauthier Ambard <gambard@chromium.org> Commit-Queue: Aliona Dangla <alionadangla@chromium.org> Cr-Commit-Position: refs/heads/main@{#1177820}
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