Removing packed=true as it only applies to primitive fields.

PostLAMessages.proto

@@ -2,16 +2,16 @@ syntax = "proto3";
 option optimize_for = LITE_RUNTIME;
 
 message ciphertext_client_data_field {
-    repeated bytes bytes = 1 [packed=true];
+    repeated bytes bytes = 1;
 }
 
 message extension_to_decryptor_enclosed_msg {
-    repeated bytes ciphertext_client_public_key = 1 [packed=true];
+    repeated bytes ciphertext_client_public_key = 1;
     repeated ciphertext_client_data_field ciphertext_fields = 2;
 }
 
 message extension_to_decryptor_ciphertext_msg {
-    repeated bytes byte = 1 [packed=true];
+    repeated bytes bytes = 1;
 }
 
 message decryptor_to_extension_msg_t {