void destroy() {
      if (!destroyed) {
        destroyed = true;
        dlock.getStats().incGrantTokens(-1);
        if (pendingRequests != null) {
          dlock.getStats().incPendingRequests(-pendingRequests.size());
          dlock.getStats().incRequestQueues(-1);
        }
      }
    }
Mark this grant token as destroyed. This should only happen to a token that is no longer in
use.
<p>
Caller must synchronize on this grant token. guarded.By this
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockGrantor.java