Revert "Rework allow_unsafe pragmas in media/"

This reverts commit afe4f21de2a343cc414f1e0606f3f318929e839f.

Reason for revert: Caused tree closure. See https://ci.chromium.org/ui/p/chromium/builders/ci/linux-cast-arm-rel/38895/overview.

Bug: 409340989
Original change's description:
> Rework allow_unsafe pragmas in media/
>
> Automated CL via tools/clang/unsafe_pragma_rewriter/ scripts.
>
> Bug: 409340989
> Change-Id: Id81f37f22fdde26de54a19278df62aa9a07739db
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6779565
> Reviewed-by: Nico Weber <[email protected]>
> Owners-Override: Nico Weber <[email protected]>
> Commit-Queue: Tom Sepez <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#1493781}

Bug: 409340989
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I04291436137994cba24384581da50b115e3a65f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6799044
Commit-Queue: Andy Phan <[email protected]>
Owners-Override: Andy Phan <[email protected]>
Reviewed-by: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1493789}
NOKEYCHECK=True
GitOrigin-RevId: 21778bc49bb739be574234d4023e36eb7ede5bf3
4 files changed