Don't look through the buffer cache in protected contexts am: a0c7cca5 am: 6fd105f0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24666066



Change-Id: I479e31703608ad1df4ada5453367d700fc19e7c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>