Revert "Change the resource cache key and limit the maximum size..."

Revert submission 24318542-PackageResourceCache

Reason for revert: presubmit failure b/295414863

Reverted changes: /q/submissionid:24318542-PackageResourceCache

Change-Id: I0199d9687373c5c0056a4af263017e84eb33e0eb
1 file changed