Revert "libsnapshot: Off-line tool for converting OTA payloads t..."

Revert submission 1405248-vab-offline-cow

Reason for revert: Reason for revert: Droidcop-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_master-without-vendor&target=sdk_mac&lkgb=6790614&lkbb=6791107&fkbb=6791107, bug 166383275
Reverted Changes:
If8a1bbf99:Expose extent_ranges for libsnapshot to use in res...
I22c86546f:libsnapshot: Off-line tool for converting OTA payl...

Change-Id: I7f85fb24a350c610d0837886716c22c2742ab144