Merge "Don't use String8::empty" into main am: d8ac0c199c am: 1c7d5fb977 am: 59227924a0 am: 8448632f94

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2707675

Change-Id: I13e60437a00659680aa877c39e50ff7a36e7b14f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>