[Payments] Desktop: never return false in incognito mode for canMakePayment

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/payments/test_chrome_payment_request_delegate.h"
 
 #include <utility>
 
 #include "content/public/browser/web_contents.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace payments {
 
 TestChromePaymentRequestDelegate::TestChromePaymentRequestDelegate(
     content::WebContents* web_contents,
     PaymentRequestDialogView::ObserverForTest* observer,
-    views::WidgetObserver* widget_observer)
+    views::WidgetObserver* widget_observer,
+    bool is_incognito)
     : ChromePaymentRequestDelegate(web_contents),
       observer_(observer),
-      widget_observer_(widget_observer) {}
+      widget_observer_(widget_observer),
+      is_incognito_for_testing_(is_incognito) {}
 
 void TestChromePaymentRequestDelegate::ShowDialog(PaymentRequest* request) {
   PaymentRequestDialogView* dialog_view =
       new PaymentRequestDialogView(request, observer_);
   dialog_view->ShowDialog();
 
   // The widget is now valid, so register its observer.
   views::Widget* widget = dialog_view->GetWidget();
   widget->AddObserver(widget_observer_);
 
   dialog_ = std::move(dialog_view);
 }
 
+bool TestChromePaymentRequestDelegate::IsIncognito() const {
+  return is_incognito_for_testing_;
+}
+
 }  // namespace payments