Revert "Notify waiters when releasing the monitor"

This reverts commit 1ebb52ca.

Reason for revert: Break ART run-test ThreadStress by failing this
assertion:

  dalvikvm32 E 11-06 09:43:27 27100 27851 mutex-inl.h:134] Lock level violation: holding "a thread wait mutex" (level ThreadWaitLock - 9) while locking "a monitor lock" (level MonitorLock - 54)
  dalvikvm32 F 11-06 09:43:27 27100 27851 mutex-inl.h:145] Check failed: !bad_mutexes_held

Bug: 117842465
Change-Id: I888201bf5c252c8366618d9169a37e4a4cc29734