Revert "[sandbox] Enable sandboxed pointers on Desktop"

This reverts commit 48481a67.

Reason for revert: Fails roll into Chromium due to Asan, Android, and Fuchsia bots. See https://crrev.com/c/3631159

Original change's description:
> [sandbox] Enable sandboxed pointers on Desktop
>
> Bug: chromium:1218005
> Change-Id: I3df750ee9101779952d8b1ae630c4d3b7563084b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3578645
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Samuel Groß <saelo@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80376}

Bug: chromium:1218005
Change-Id: I646f09947b5a32d1ada60887352cc3989e66ada3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3632099
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Samuel Groß <saelo@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80388}

BUILD.gn

@@ -501,11 +501,6 @@ if (v8_enable_sandbox == "") {
       v8_enable_external_code_space
 }
 
-# Enable sandboxed pointers on desktop when the sandbox is enabled.
-if (v8_enable_sandbox && !is_android && !is_fuchsia) {
-  v8_enable_sandboxed_pointers = true
-}
-
 # Enable all available sandbox features if sandbox future is enabled.
 if (v8_enable_sandbox_future) {
   v8_enable_sandboxed_pointers = true