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: I3eccf58dceb2b81ebded3ef1b459abab07949022
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>