[WebPayments] Extracting common code from Shipping + Contact Info views.

components/payments/content/payment_request.h

Index: components/payments/content/payment_request.h
diff --git a/components/payments/content/payment_request.h b/components/payments/content/payment_request.h
index 4a6507ddc24a53997e1c84bbf5accbe3af18fc60..7933e61ffcd379d0b5e751265c5209d81006830d 100644
--- a/components/payments/content/payment_request.h
+++ b/components/payments/content/payment_request.h
@@ -143,6 +143,7 @@ class PaymentRequest : public mojom::PaymentRequest,
   autofill::PersonalDataManager* personal_data_manager() {
     return delegate_->GetPersonalDataManager();
   }
+  const std::string& locale() { return delegate_->GetApplicationLocale(); }
 
   payments::mojom::PaymentDetails* details() { return details_.get(); }
   payments::mojom::PaymentOptions* options() { return options_.get(); }