Respond to CR.

// FREEBIE

src/Messages/Interactions/TSErrorMessage.m

@@ -49,7 +49,7 @@
                failedMessageType:(TSErrorMessageType)errorMessageType
 {
     TSContactThread *contactThread =
-        [TSContactThread getOrCreateThreadWithContactId:envelope.source transaction:transaction relay:nil];
+        [TSContactThread getOrCreateThreadWithContactId:envelope.source transaction:transaction];
 
     return [self initWithTimestamp:envelope.timestamp inThread:contactThread failedMessageType:errorMessageType];
 }

src/Messages/OWSUnknownContactBlockOfferMessage.m

@@ -38,6 +38,9 @@ NS_ASSUME_NONNULL_BEGIN
 {
     // Always use date, since we're creating these interactions after the fact
     // and back-dating them.
+    //
+    // By default [TSMessage receiptDateForSorting] will prefer to use receivedAtDate
+    // which is not back-dated.
     return self.date;
 }