Remove //ppapi/examples

This is fairly standalone so go ahead and delete this now.

Bug: 40511450
Change-Id: I4ddd352ec44f3fb4f3d2246de96ca7653f951ca6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6670783
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@chromium.org>
Reviewed-by: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1478492}
NOKEYCHECK=True
GitOrigin-RevId: 144ce8ab6db114f4966000037dc4da48008c8732