Revert "extensions: Add static_assert(BUILDFLAG(ENABLE_EXTENSIONS_CORE)), pt 11"

This reverts commit 78fe6397efb80651bcf5c089bdf99895fead2bd7.

Reason for revert: Tree closed after change: https://ci.chromium.org/ui/p/chromium/builders/ci/android-webview-13-x64-hostside-rel/45425/overview

Original change's description:
> extensions: Add static_assert(BUILDFLAG(ENABLE_EXTENSIONS_CORE)), pt 11
>
> Add to files we have ported to desktop Android, in this case the
> files starting with chrome*
>
> Bug: 443984428
> Change-Id: I1df91eb59733bd7c331b1b6cb0e38c210a67e810
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6967450
> Reviewed-by: Matthew Denton <mpdenton@chromium.org>
> Reviewed-by: Zhengzheng Liu <zhzhliu@chromium.org>
> Commit-Queue: James Cook <jamescook@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1518939}

Bug: 443984428
Change-Id: Ie8a7cf7edbde5ff29339fd40baf25fcde8836937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6973932
Reviewed-by: Shibalik Mohapatra <shibalik@chromium.org>
Commit-Queue: Shibalik Mohapatra <shibalik@chromium.org>
Owners-Override: Shibalik Mohapatra <shibalik@chromium.org>
Auto-Submit: Jack Thiesen <jthiesen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1518969}