Remove redundant async

src/vs/base/common/async.ts

@@ -238,7 +238,7 @@ export class Delayer<T> {
 		}
 	}
 
-	async fire(): TPromise<void> {
+	fire(): void {
 		this.cancelTimeout();
 
 		if (this.completionPromise) {

src/vs/base/test/common/async.test.ts

@@ -367,10 +367,9 @@ suite('Async', () => {
 
 		assert(delayer.isTriggered());
 
-		delayer.fire().then(() => {
+		delayer.fire();
 		assert(!delayer.isTriggered());
 	});
-	});
 
 	test('Delayer - fire after finished', async function (this, done) {
 		const sleep = time => new Promise((resolve) => setTimeout(resolve, time));