Revert "Revert "Make OpenJDK 8 the default""

Reapply the switch to JDK 8 on aosp/master.

This reverts commit 85bddfdedffb425d85657314591a57191113806b.

Change-Id: If2e8733ba78b007d37914c0512cd6be1bd4c1e69
3 files changed