Fix crash in release mode of payment manifest parser.

components/payments/content/payment_manifest_parser_host.cc

Index: components/payments/content/payment_manifest_parser_host.cc
diff --git a/components/payments/content/payment_manifest_parser_host.cc b/components/payments/content/payment_manifest_parser_host.cc
index 97cead1597e0667d6cc10d319c75fd9300689d56..0af9a38c23b3b6edcec3713ecef62b66e7de6e9f 100644
--- a/components/payments/content/payment_manifest_parser_host.cc
+++ b/components/payments/content/payment_manifest_parser_host.cc
@@ -82,9 +82,6 @@ void PaymentManifestParserHost::OnPaymentMethodParse(
     return;
   }
 
-  PaymentMethodCallback callback = std::move(pending_callback_it->second);
-  pending_payment_method_callbacks_.erase(pending_callback_it);
-
   const size_t kMaximumNumberOfWebAppUrls = 100U;
   if (web_app_manifest_urls.size() > kMaximumNumberOfWebAppUrls) {
     // If more than 100 items, then something went wrong in the utility
@@ -102,6 +99,9 @@ void PaymentManifestParserHost::OnPaymentMethodParse(
     }
   }
 
+  PaymentMethodCallback callback = std::move(pending_callback_it->second);
+  pending_payment_method_callbacks_.erase(pending_callback_it);
+
   // Can trigger synchronous deletion of this object, so can't access any of
   // the member variables after this block.
   std::move(callback).Run(web_app_manifest_urls);