PackageAbiHepler no longer modifies Package

Bug: 137881067
Test: atest ScanTests
Exempt-From-Owner-Approval: Already approved in
https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/base/+/8884794

Change-Id: I50f7c200bc97f08e49f33158bf1df7881b9b231a
Merged-In: I060f2d1395886a9eebce703bd80149559f9c39bb
5 files changed