[Payments] Improve the closing of the PR dialog.

chrome/browser/payments/chrome_payment_request_delegate.cc

Index: chrome/browser/payments/chrome_payment_request_delegate.cc
diff --git a/chrome/browser/payments/chrome_payment_request_delegate.cc b/chrome/browser/payments/chrome_payment_request_delegate.cc
index 5a65cb149f25e3d81d52e2607c36cd3c6d0aee15..58a649228d8b1c3670e3299e3343c224d62e482e 100644
--- a/chrome/browser/payments/chrome_payment_request_delegate.cc
+++ b/chrome/browser/payments/chrome_payment_request_delegate.cc
@@ -4,20 +4,30 @@
 
 #include "chrome/browser/payments/chrome_payment_request_delegate.h"
 
+#include "base/macros.h"
 #include "chrome/browser/autofill/personal_data_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_dialogs.h"
+#include "components/payments/payment_request_dialog.h"
 #include "content/public/browser/web_contents.h"
 
 namespace payments {
 
 ChromePaymentRequestDelegate::ChromePaymentRequestDelegate(
     content::WebContents* web_contents)
-  : web_contents_(web_contents) {}
+    : dialog_(nullptr), web_contents_(web_contents) {}
 
-void ChromePaymentRequestDelegate::ShowPaymentRequestDialog(
-    PaymentRequest* request) {
-  chrome::ShowPaymentRequestDialog(request);
+void ChromePaymentRequestDelegate::ShowDialog(PaymentRequest* request) {
+  DCHECK_EQ(nullptr, dialog_);
+  dialog_ = chrome::CreatePaymentRequestDialog(request);
+  dialog_->ShowDialog();
+}
+
+void ChromePaymentRequestDelegate::CloseDialog() {
+  if (dialog_) {
+    dialog_->CloseDialog();
+    dialog_ = nullptr;
+  }
 }
 
 autofill::PersonalDataManager*