[PR5878] Update to improve maintability [PR5938 required]... (#5940)

For this update to properly work [PR 5938](https://github.com/mattermost/platform/pull/5938) is required!

webapp/components/search_bar.jsx

@@ -74,17 +74,8 @@ export default class SearchBar extends React.Component {
             if (!Utils.areObjectsEqual(newState, this.state)) {
                 this.setState(newState);
             }
-            if (doSearch && newState && newState.searchTerm.length) {
+            if (doSearch) {
-                performSearch(
+                this.handleSearch(newState.searchTerm, isMentionSearch);
-                    newState.searchTerm,
-                    isMentionSearch,
-                    () => {
-                        this.handleSearchOnSuccess();
-                    },
-                    () => {
-                        this.handleSearchOnError();
-                    }
-                );
             }
         }
     }