message: Don't assert on replay thread for CancelReplayLoop
  * This is the one function that CAN be called from another thread by definition
  since the replay thread is blocked running the replay loop.
diff: @@ -1786,8 +1786,6 @@ void ReplayController::ReplayLoop(WindowingData window, ResourceId texid)
  void ReplayController::CancelReplayLoop()
  {
  - CHECK_REPLAY_THREAD();
  -
  Atomic::Inc32(&m_ReplayLoopCancel);
  // wait for it to actually finish before returning
  