[Payments] Display the shipping option error alongside the address

components/payments/content/payment_request_spec.cc

Index: components/payments/content/payment_request_spec.cc
diff --git a/components/payments/content/payment_request_spec.cc b/components/payments/content/payment_request_spec.cc
index 5e58552f51e8866cd314d3ba6188a7bf8e2c64d1..1aca4d5eae3ad48ec4858622a283dff31cc6db14 100644
--- a/components/payments/content/payment_request_spec.cc
+++ b/components/payments/content/payment_request_spec.cc
@@ -166,6 +166,7 @@ void PaymentRequestSpec::UpdateSelectedShippingOption() {
   if (!request_shipping())
     return;
 
+  selected_shipping_option_error_.clear();
   // As per the spec, the selected shipping option should initially be the last
   // one in the array that has its selected field set to true.
   auto selected_shipping_option_it = std::find_if(
@@ -177,7 +178,8 @@ void PaymentRequestSpec::UpdateSelectedShippingOption() {
     selected_shipping_option_ = selected_shipping_option_it->get();
   } else {
     // It's possible that there is no selected shipping option.
-    // TODO(crbug.com/710004): Show an error in this case.
+    if (!details().error.empty())
+      selected_shipping_option_error_ = details().error;
     selected_shipping_option_ = nullptr;
   }
 }