spanification: Add `#pragma allow_unsafe_buffers` to renderer/core/

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: If81c731b6a1e4b7462ebcb2e1197f2607e3b8908
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5689271
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1325420}
NOKEYCHECK=True
GitOrigin-RevId: f83b758b5980e3fb3eafa11bab38116206907459
1 file changed