Addressing code review comments

Author: eldhosembabu

firebase-messaging/src/test/java/com/google/firebase/messaging/FirebaseMessagingRoboTest.java

@@ -391,8 +391,6 @@ public void deleteToken_withFiid() throws Exception {
     writeTokenToStore("fake_token");
     Task<Void> deleteTokenTask = messaging.deleteToken();
 
-    ShadowLooper.idleMainLooper();
-    Tasks.await(deleteTokenTask, 5, SECONDS);
     ShadowLooper.idleMainLooper();
     Tasks.await(deleteTokenTask, 5, SECONDS);
     verify(mockFiid)