Change Phone Number notifications

ts/textsecure/MessageReceiver.ts

@@ -95,6 +95,7 @@ import {
   ContactSyncEvent,
   GroupEvent,
   GroupSyncEvent,
+  EnvelopeEvent,
 } from './messageReceiverEvents';
 
 // TODO: remove once we move away from ArrayBuffers
@@ -459,6 +460,11 @@ export default class MessageReceiver
     handler: (ev: GroupSyncEvent) => void
   ): void;
 
+  public addEventListener(
+    name: 'envelope',
+    handler: (ev: EnvelopeEvent) => void
+  ): void;
+
   public addEventListener(name: string, handler: EventHandler): void {
     return super.addEventListener(name, handler);
   }
@@ -981,8 +987,6 @@ export default class MessageReceiver
     if (this.stoppingProcessing) {
       return;
     }
-    // No decryption is required for delivery receipts, so the decrypted field of
-    //   the Unprocessed model will never be set
 
     if (envelope.content) {
       await this.innerHandleContentMessage(envelope, plaintext);