[Autofill Auth] Encode Credential ID with standard Base64 (not url-safe).

The url-safe base64 encoding of the credential_id was being sent to Payments
server, but only standard base64 is accepted. This CL ensures only standard
base64 is used.

Bug: 949269
Change-Id: I423ab314aeb6a40f21dcc1e9304329afa7a52147
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897493Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#713169}

components/autofill/core/browser/payments/credit_card_fido_authenticator.cc

@@ -585,7 +585,8 @@ CreditCardFIDOAuthenticator::ParseCredentialDescriptor(
 base::Value CreditCardFIDOAuthenticator::ParseAssertionResponse(
     GetAssertionAuthenticatorResponsePtr assertion_response) {
   base::Value response = base::Value(base::Value::Type::DICTIONARY);
-  response.SetKey("credential_id", base::Value(assertion_response->info->id));
+  response.SetKey("credential_id",
+                  BytesToBase64(assertion_response->info->raw_id));
   response.SetKey("authenticator_data",
                   BytesToBase64(assertion_response->authenticator_data));
   response.SetKey("client_data",

components/autofill/core/browser/payments/credit_card_fido_authenticator_unittest.cc

@@ -319,7 +319,7 @@ TEST_F(CreditCardFIDOAuthenticatorTest, ParseAssertionResponse) {
   GetAssertionAuthenticatorResponsePtr assertion_response_ptr =
       GetAssertionAuthenticatorResponse::New();
   assertion_response_ptr->info = blink::mojom::CommonCredentialInfo::New();
-  assertion_response_ptr->info->id = kTestCredentialId;
+  assertion_response_ptr->info->raw_id = Base64ToBytes(kTestCredentialId);
   assertion_response_ptr->signature = Base64ToBytes(kTestSignature);
 
   base::Value assertion_response_json =