Fix copy-paste error

Author: katcharov

driver-reactive-streams/src/main/com/mongodb/reactivestreams/client/internal/gridfs/GridFSUploadPublisherImpl.java

@@ -50,7 +50,6 @@
 import static com.mongodb.reactivestreams.client.internal.TimeoutHelper.collectionWithTimeoutDeferred;
 import static java.time.Duration.ofMillis;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.concurrent.TimeUnit.NANOSECONDS;
 
 
 /**
@@ -266,7 +265,7 @@ private Mono<Long> createSaveChunksMono(final AtomicBoolean terminated, @Nullabl
      * @return Mono that emits a {@link MongoOperationTimeoutException}.
      */
     private static Mono<MongoOperationTimeoutException> createMonoTimer(final @Nullable Timeout timeout) {
-        return Timeout.nullAsInfinite(timeout).call(NANOSECONDS,
+        return Timeout.nullAsInfinite(timeout).call(MILLISECONDS,
                 () -> Mono.never(),
                 (ms) -> Mono.delay(ofMillis(ms)).then(createTimeoutMonoError()),
                 () -> createTimeoutMonoError());