Cancels payment request when Settings is tapped, and opens the Autofill settings page.

ios/chrome/browser/payments/payment_request_coordinator.mm

 // Copyright 2016 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.
 
 #import "ios/chrome/browser/payments/payment_request_coordinator.h"
 
 #include <unordered_set>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 317 matching lines @@
 - (void)paymentRequestViewControllerDidCancel:
     (PaymentRequestViewController*)controller {
   [_delegate paymentRequestCoordinatorDidCancel:self];
 }
 
 - (void)paymentRequestViewControllerDidConfirm:
     (PaymentRequestViewController*)controller {
   [self sendPaymentResponse];
 }
 
+- (void)paymentRequestViewControllerDidSelectSettings:
+    (PaymentRequestViewController*)controller {
+  [_delegate paymentRequestCoordinatorDidSelectSettings:self];
+}
+
 - (void)paymentRequestViewControllerDidSelectPaymentSummaryItem:
     (PaymentRequestViewController*)controller {
   _itemsDisplayCoordinator = [[PaymentItemsDisplayCoordinator alloc]
       initWithBaseViewController:_viewController];
   [_itemsDisplayCoordinator setPaymentRequest:_paymentRequest];
   [_itemsDisplayCoordinator setDelegate:self];
 
   [_itemsDisplayCoordinator start];
 }
 
@@ skipping 118 matching lines @@
 - (void)paymentMethodSelectionCoordinatorDidReturn:
     (PaymentMethodSelectionCoordinator*)coordinator {
   // Clear the 'Updated' label on the payment summary item, if there is one.
   [_viewController updatePaymentSummaryWithTotalValueChanged:NO];
 
   [_methodSelectionCoordinator stop];
   _methodSelectionCoordinator = nil;
 }
 
 @end