Revert^2 "Mark threads started by Daemons.java as systemDaemon"

This reverts commit 07cfc3f74a422d9725cca0ad32915709a3b37862.

Reason for revert: Fixed flake with test 1919
Test: ./art/test.py --host -j80

Bug: 123696564
Bug: 124284724

Change-Id: I958a48ebfe2e3989bd855fc4abe12cec56bf9df5
2 files changed