Revert^2 "Enforce files loaded in DexFile to be read-only" am: e5e7978754 am: ecd16e64e9 am: 9d34ae20b8 am: 1638b3fc59

Original change: https://android-review.googlesource.com/c/platform/art/+/2218806

Change-Id: Ie7dacc50a36c357a7f140e5e73d09bb2fc40629c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>