[Payment Request] Error message screen

ios/chrome/browser/payments/payment_method_selection_view_controller.mm

Index: ios/chrome/browser/payments/payment_method_selection_view_controller.mm
diff --git a/ios/chrome/browser/payments/payment_method_selection_view_controller.mm b/ios/chrome/browser/payments/payment_method_selection_view_controller.mm
index 2ab51c94e663d0774bfd1011dec0c76b82f5df0a..dfdbbc1dcff763ca5b42bcefa16f8237138aa1d4 100644
--- a/ios/chrome/browser/payments/payment_method_selection_view_controller.mm
+++ b/ios/chrome/browser/payments/payment_method_selection_view_controller.mm
@@ -27,8 +27,8 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
-NSString* const kPaymentMethodSelectionCollectionViewId =
-    @"kPaymentMethodSelectionCollectionViewId";
+NSString* const kPaymentMethodSelectionCollectionViewID =
+    @"kPaymentMethodSelectionCollectionViewID";
 
 namespace {
 
@@ -71,6 +71,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
     [self setTitle:l10n_util::GetNSString(
                        IDS_IOS_PAYMENT_REQUEST_METHOD_SELECTION_TITLE)];
 
+    // Set up leading (return) button.
     UIBarButtonItem* returnButton =
         [ChromeIcon templateBarButtonItemWithImage:[ChromeIcon backIcon]
                                             target:nil
@@ -138,7 +139,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
 - (void)viewDidLoad {
   [super viewDidLoad];
   self.collectionView.accessibilityIdentifier =
-      kPaymentMethodSelectionCollectionViewId;
+      kPaymentMethodSelectionCollectionViewID;
 
   // Customize collection view settings.
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;