Remove declarations of functions that have already been removed. am: dfc8043ac3 am: 8ec3b62147

Original change: https://android-review.googlesource.com/c/platform/system/logging/+/2865881

Change-Id: If69cc174ed97df384098123dacd9729a3e1f903f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>