[Sync] Remove card class.

Card class (debit, prepaid, credit, unknown) where used only for
"supportedTypes" field of Payment Request, which has been removed.

Bug: 981907
Change-Id: I4348f6d2e09975a3e5e4ec9aa5a0407916269a89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005091Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732868}

components/sync/protocol/autofill_specifics.proto

@@ -107,6 +107,9 @@ message CloudTokenData {
 }
 
 message WalletMaskedCreditCard {
+  reserved 9;
+  reserved "card_class";
+
   enum WalletCardStatus {
     VALID = 0;
     EXPIRED = 1;
@@ -125,13 +128,6 @@ message WalletMaskedCreditCard {
     UNIONPAY = 9;
   }
 
-  enum WalletCardClass {
-    UNKNOWN_CARD_CLASS = 0;
-    CREDIT = 1;
-    DEBIT = 2;
-    PREPAID = 3;
-  }
-
   // Server-generated unique ID string. This is opaque to the client.
   optional string id = 1;
 
@@ -154,9 +150,6 @@ message WalletMaskedCreditCard {
   // The WalletPostalAddress.id of the billing address.
   optional string billing_address_id = 8;
 
-  // Card class: credit, debit, or prepaid.
-  optional WalletCardClass card_class = 9;
-
   // Issuing Bank name which is internationalized (e.g. "Chase", "工商银行")
   optional string bank_name = 10;