Reland "[PinnedTabs] Default enable for desktop"

This is a reland of commit 6544bb478e63703062231fef8ad72f09ff753734

Original change's description:
> [PinnedTabs] Default enable for desktop
>
> Bug: 427242080
> Change-Id: I5725e67d0a7b555ea904f2f764362873dce0de4f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6986803
> Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
> Commit-Queue: Theresa Sullivan <twellington@chromium.org>
> Reviewed-by: Theresa Sullivan <twellington@chromium.org>
> Auto-Submit: Zhe Li <zheliooo@google.com>
> Cr-Commit-Position: refs/heads/main@{#1520944}

Bug: 427242080
Change-Id: Ieecb68807718e9e84948fba3f6e7ff5ff785c8b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6990770
Auto-Submit: Zhe Li <zheliooo@google.com>
Commit-Queue: Theresa Sullivan <twellington@chromium.org>
Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1521508}