Set enable_ppapi to false

enable_nacl is always false, so enable_ppapi is also false now.

R=dschuff@chromium.org

Bug: 40511450
Change-Id: Icdeb1b2fde81589461b32e3d743b99d68acf04a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6668113
Auto-Submit: Fabian Sommer <fabiansommer@chromium.org>
Commit-Queue: Derek Schuff <dschuff@chromium.org>
Reviewed-by: Derek Schuff <dschuff@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1477996}
NOKEYCHECK=True
GitOrigin-RevId: bb6bbf7cee8a560530f71d80ba9edfc3cd737f67