Revert "Deprecate ArrayView alias"

This reverts commit af15fac735f8a6d66b250491914dfe086cbbb125.

Reason for revert: breaks downstream

Original change's description:
> Deprecate ArrayView alias
>
> To prevent new usages in WebRTC and trigger clang inliner bots to update
> downstream projects to use std::span directly
>
> Bug: webrtc:439801349
> Change-Id: I67d9dbb25861fea4ac2509d84474c574a9766774
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/461500
> Reviewed-by: Evan Shrubsole <eshr@webrtc.org>
> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#47320}

Bug: webrtc:439801349
Change-Id: I82e5856f978f0a0cf7cab4b74f21e44fa1154e2d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/461882
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47332}