Revert "Replace all trivial Promise.defer usages with regular Promises"

This reverts commit 44401d73

src/components/views/rooms/Autocomplete.js

@@ -26,7 +26,6 @@ import { Room } from 'matrix-js-sdk';
 
 import SettingsStore from "../../../settings/SettingsStore";
 import Autocompleter from '../../../autocomplete/Autocompleter';
-import {sleep} from "../../../utils/promise";
 
 const COMPOSER_SELECTED = 0;
 
@@ -106,11 +105,13 @@ export default class Autocomplete extends React.Component {
             autocompleteDelay = 0;
         }
 
-        return new Promise((resolve) => {
-            this.debounceCompletionsRequest = setTimeout(() => {
-                resolve(this.processQuery(query, selection));
-            }, autocompleteDelay);
-        });
+        const deferred = Promise.defer();
+        this.debounceCompletionsRequest = setTimeout(() => {
+            this.processQuery(query, selection).then(() => {
+                deferred.resolve();
+            });
+        }, autocompleteDelay);
+        return deferred.promise;
     }
 
     processQuery(query, selection) {
@@ -196,16 +197,16 @@ export default class Autocomplete extends React.Component {
     }
 
     forceComplete() {
-        return new Promise((resolve) => {
-            this.setState({
-                forceComplete: true,
-                hide: false,
-            }, () => {
-                this.complete(this.props.query, this.props.selection).then(() => {
-                    resolve(this.countCompletions());
-                });
+        const done = Promise.defer();
+        this.setState({
+            forceComplete: true,
+            hide: false,
+        }, () => {
+            this.complete(this.props.query, this.props.selection).then(() => {
+                done.resolve(this.countCompletions());
             });
         });
+        return done.promise;
     }
 
     onCompletionClicked(selectionOffset: number): boolean {