[Payment Request] Fixes the behavior of selector coordinators in edit mode.

ios/chrome/browser/ui/payments/payment_request_selector_view_controller.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
@@ skipping 40 matching lines @@
 
 // The delegate to be notified when the user selects an item, returns without
 // selection, or decides to add an item.
 @property(nonatomic, weak) id<PaymentRequestSelectorViewControllerDelegate>
     delegate;
 
 // The data source for this view controller.
 @property(nonatomic, weak) id<PaymentRequestSelectorViewControllerDataSource>
     dataSource;
 
+// Whether or not the editor is in the editing mode.
+@property(nonatomic, assign, getter=isEditing) BOOL editing;
+
 // Convenience initializer. Initializes this object with the
 // CollectionViewControllerStyleAppBar style and sets up the leading (back)
 // button.
 - (instancetype)init;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_H_