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

ios/chrome/app/main_controller.mm

 // Copyright 2012 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/app/main_controller.h"
 
 #include <memory>
 #include <string>
 
 #import <CoreSpotlight/CoreSpotlight.h>
@@ skipping 1503 matching lines @@
       break;
     case IDC_SHOW_CONTEXTUAL_SEARCH_SETTINGS:
       [self showContextualSearchSettingsController];
       break;
     case IDC_CLOSE_MODALS:
       [self dismissModalDialogsWithCompletion:nil];
       break;
     case IDC_SHOW_ADD_ACCOUNT:
       [self showAddAccount];
       break;
+    case IDC_SHOW_AUTOFILL_SETTINGS:
+      [self showAutofillSettings];
+      break;
     default:
       // Unknown commands get dropped with a warning.
       NOTREACHED() << "Unknown command id " << command;
       LOG(WARNING) << "Unknown command id " << command;
       break;
   }
 }
 
 #pragma mark - chromeExecuteCommand helpers
 
@@ skipping 472 matching lines @@
     return;
   _settingsNavigationController.reset([SettingsNavigationController
       newSavePasswordsController:_mainBrowserState
                         delegate:self]);
   [[self topPresentedViewController]
       presentViewController:_settingsNavigationController
                    animated:YES
                  completion:nil];
 }
 
+- (void)showAutofillSettings {
+  if (_settingsNavigationController)
+    return;
+  _settingsNavigationController.reset([SettingsNavigationController
+      newAutofillController:_mainBrowserState
+                   delegate:self]);
+  [[self topPresentedViewController]
+      presentViewController:_settingsNavigationController
+                   animated:YES
+                 completion:nil];
+}
+
 - (void)showReportAnIssue {
   if (_settingsNavigationController)
     return;
   _settingsNavigationController.reset([SettingsNavigationController
       newUserFeedbackController:_mainBrowserState
                        delegate:self
              feedbackDataSource:self]);
   [[self topPresentedViewController]
       presentViewController:_settingsNavigationController
                    animated:YES
@@ skipping 572 matching lines @@
   };
 
   callbackCounter->IncrementCount();
   [self removeBrowsingDataFromBrowserState:_mainBrowserState
                                       mask:removeAllMask
                                 timePeriod:browsing_data::TimePeriod::ALL_TIME
                          completionHandler:decrementCallbackCounterCount];
 }
 
 @end