Android: Clean up from previous bad rolls See the bug for details, but we think the presence of previous temp directories may be preventing roller CLs. Test: Locally ran roll_aosp.sh Bug: angleproject:8352 Change-Id: I7851185b8c77d1b91c7289e3a13c5c0b4175745c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4877189 Commit-Queue: Cody Northrop <cnorthrop@google.com> Reviewed-by: Roman Lavrov <romanl@google.com>