Only UTF-8 sync tags for Wallet metadata.

sync/protocol/autofill_specifics.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Sync protocol datatype extension for autofill.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 165 matching lines @@
 message WalletMetadataSpecifics {
   enum Type {
     UNKNOWN = 0;
     CARD = 1;
     ADDRESS = 2;
   }
 
   // The type of the Wallet metadata.
   optional Type type = 1;
 
-  // Unique ID string of the corresponding Wallet data.
+  // Base64 encoding of the unique ID string of the corresponding Wallet data.
   // For Wallet cards, this value is server generated and opaque to Chrome.
   // For Wallet addresses, this is a SHA1 hash of the following fields:
   //
   // - First name
   // - Middle name
   // - Last name
   // - Company name
   // - Street address
   // - Dependent locality
   // - City
   // - State
   // - Zip code
   // - Sorting code
   // - Country
-  // - Phone numbers
-  //
-  // Finally, Chrome appends the address language code to the end of the hash.
+  // - Phone number
+  // - Language code
   optional string id = 2;
 
   // The number of times that this Wallet card or address was used.
   optional int64 use_count = 3;
 
   // The last use date of this Wallet card or address. Measured in microseconds
   // since the Windows epoch (1601).
   optional int64 use_date = 4;
 }