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

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: I1b62c850cdf1420426b95b8ec41e88f3aa1d204b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5686121
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1325164}
NOKEYCHECK=True
GitOrigin-RevId: 28a7d7a0759c5e9b9dfe894e181d4162b6427aa2
1 file changed