Simply Replace libchrome StringToXXs with android base ones am: 3357e27882

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3310800

Change-Id: I4e8fde2a34d0dba2665b887e423d76d23e48a533
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>