MessageReceiver: removeFromCache no longer returns a promise

libtextsecure/message_receiver.js

@@ -719,9 +719,8 @@ MessageReceiver.prototype.extend({
                 throw error;
               }
 
-              return this.removeFromCache(envelope).then(() => {
+              this.removeFromCache(envelope);
-                throw error;
+              throw error;
-              });
             }
           );
         break;