remove delete useless methods

src/app/models/chatMethod.ts

@@ -1,8 +1,8 @@
-export interface Ts {
+interface Ts {
     $date: any;
 }
 
-export interface U {
+interface U {
     _id: string;
     username: string;
     name: string;

src/app/services/chat/room.service.ts

@@ -76,8 +76,6 @@ export class RoomService {
     this.hasLoadHistory = true
   }
 
-  create() {}
-  deleteMessage(msgId) {}
   ReactToMessage() {}
 
   private calDateDuration(date = null) {