Revert "PERF: Send down gaps as the relevant posts load instead of front loading."

This reverts commit 4c3352528e.

app/assets/javascripts/discourse/models/post-stream.js.es6

@@ -850,10 +850,6 @@ export default RestModel.extend({
       if (posts) {
         posts.forEach(p => this.storePost(store.createRecord("post", p)));
       }
-
-      if (result.post_stream.gaps) {
-        this.set("gaps", _.merge(this.get("gaps"), result.post_stream.gaps));
-      }
     });
   },