[Payments] Improve the closing of the PR dialog.

components/payments/payment_request_delegate.h

Index: components/payments/payment_request_delegate.h
diff --git a/components/payments/payment_request_delegate.h b/components/payments/payment_request_delegate.h
index 9e666541661438920e093ad9113b706c373009cc..08988db544cff769999b64f277602d977735e7c4 100644
--- a/components/payments/payment_request_delegate.h
+++ b/components/payments/payment_request_delegate.h
@@ -18,7 +18,11 @@ class PaymentRequestDelegate {
   virtual ~PaymentRequestDelegate() {}
 
   // Shows the Payment Request dialog for the given |request|.
-  virtual void ShowPaymentRequestDialog(PaymentRequest* request) = 0;
+  virtual void ShowDialog(PaymentRequest* request) = 0;
+
+  // Closes the same dialog that was opened by this delegate. Must be safe to
+  // call when the dialog is not showing.
+  virtual void CloseDialog() = 0;
 
   // Gets the PersonalDataManager associated with this PaymentRequest flow.
   virtual autofill::PersonalDataManager* GetPersonalDataManager() = 0;