Properly update the payment request credit card billing combob box when a new address is added.

chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc

Index: chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
diff --git a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
index 4562c3355bb6b68a5de560009b3982c2e1ddb481..09fa367985cc440e241a150383822593e2496e2b 100644
--- a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
+++ b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
@@ -372,9 +372,9 @@ void CreditCardEditorViewController::AddAndSelectNewBillingAddress(
   autofill::AddressComboboxModel* model =
       static_cast<autofill::AddressComboboxModel*>(address_combobox->model());
   int index = model->AddNewProfile(profile);
-  address_combobox->SetSelectedIndex(index);
-  // Force revalidation.
-  address_combobox->OnBlur();
+  // SetSelectedIndex doesn't trigger a perform action notification, which is
+  // needed to update the valid state.
+  address_combobox->SetSelectedRow(index);
 }
 
 CreditCardEditorViewController::CreditCardValidationDelegate::