Revert "Use RAII for preventing user-code suspensions"

This reverts commit 9c8f34448e0e2b0b0b0094d75dadc3116f5610fa.

Bug: 130150240
Reason for revert: Parent causes lock-level violations in gcstress.

Change-Id: I6c29a0d37a933ac37ab835e171750c2ae5ca0599
4 files changed