[Web Payments] Constrain the dialog inner views to parent's width

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

Index: chrome/browser/ui/views/payments/payment_request_dialog_view.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog_view.cc b/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
index f5660203f2403f7c8798ba4605d285f6bd3a7318..2fa979c80d49e1e891d3714c11e5750e5dd5c257 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
@@ -11,6 +11,7 @@
 #include "chrome/browser/ui/views/payments/credit_card_editor_view_controller.h"
 #include "chrome/browser/ui/views/payments/order_summary_view_controller.h"
 #include "chrome/browser/ui/views/payments/payment_method_view_controller.h"
+#include "chrome/browser/ui/views/payments/payment_request_views_util.h"
 #include "chrome/browser/ui/views/payments/payment_sheet_view_controller.h"
 #include "chrome/browser/ui/views/payments/profile_list_view_controller.h"
 #include "chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h"
@@ -202,7 +203,7 @@ void PaymentRequestDialogView::ShowInitialPaymentSheet() {
 }
 
 gfx::Size PaymentRequestDialogView::GetPreferredSize() const {
-  return gfx::Size(450, 450);
+  return gfx::Size(kDialogWidth, kDialogHeight);
 }
 
 void PaymentRequestDialogView::ViewHierarchyChanged(