Replace base::Overloaded with absl::Overload

We are allowing absl::Overload; we should replace base::Overloaded
with it and remove.

This CL was uploaded by git cl split.

Bug: 392929829
Change-Id: I74d45360ca1e45eae1f4dcf243ed6131856d8c71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6618973
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Auto-Submit: Ho Cheung <hocheung@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Ho Cheung <hocheung@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1469379}