spanification: Add `#pragma allow_unsafe_buffers` to extension/*

https://chromium.googlesource.com/chromium/src/+/main/docs/unsafe_buffers.md#suppressions

This is a preparation to fix each files.
This CL has no behavior changes.

Bug: 351564777
Change-Id: I6e78892e2ee89a4ac367d628e3913c4cbe54d45f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5692201
Reviewed-by: danakj <danakj@chromium.org>
Auto-Submit: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1326403}
NOKEYCHECK=True
GitOrigin-RevId: 91c5465a913f16a70053f10e05b73adfe6a63aca
1 file changed