Android U Beta 1 GPL
Fix errorprone warnings that should be errors am: 083e4f4123

Original change: https://android-review.googlesource.com/c/platform/external/mobile-data-download/+/2256435

Change-Id: I8c8fc141fb299820d048f622f812110afd1b09d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>