New Google tasks don't have parents

app/src/main/java/com/todoroo/astrid/gtasks/api/GtasksInvoker.java

@@ -68,11 +68,10 @@ public class GtasksInvoker {
                 GtasksApiUtilities.unixTimeToGtasksCompletionTime(lastSyncDate).toStringRfc3339()));
   }
 
-  public @Nullable Task createGtask(String listId, Task task, String parent, String priorSiblingId)
+  public @Nullable Task createGtask(String listId, Task task, String priorSiblingId)
       throws IOException {
     Timber.d("createGtask: %s", prettyPrint(task));
-    return execute(
-        service.tasks().insert(listId, task).setParent(parent).setPrevious(priorSiblingId));
+    return execute(service.tasks().insert(listId, task).setPrevious(priorSiblingId));
   }
 
   public void updateGtask(String listId, Task task) throws IOException {

app/src/main/java/org/tasks/gtasks/GoogleTaskSynchronizer.java

@@ -302,11 +302,10 @@ public class GoogleTaskSynchronizer {
         return;
       }
     } else {
-      String parent = gtasksSyncService.getRemoteParentId(gtasksMetadata);
       String priorSibling = gtasksSyncService.getRemoteSiblingId(listId, gtasksMetadata);
 
       com.google.api.services.tasks.model.Task created =
-          gtasksInvoker.createGtask(listId, remoteModel, parent, priorSibling);
+          gtasksInvoker.createGtask(listId, remoteModel, priorSibling);
 
       if (created != null) {
         // Update the metadata for the newly created task