[Payment Request] Refactors the edit view controller

ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h

Index: ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h
diff --git a/ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h b/ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h
index 55b9c021ef60fd01ff736c78571b2d05e16afbae..d73091ed90d61ef0a4c1a27e2a690791924480e2 100644
--- a/ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h
+++ b/ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h
@@ -22,10 +22,6 @@ const NSInteger kItemTypeEnumStart = kItemTypeEnumZero + 100;
 // value on the field. Returns YES if all the fields are validated successfully.
 - (BOOL)validateForm;
 
-// Called before the editor field items are added to the the collection view
-// model. Subclasses override this method to add items before the editor fields.
-- (void)loadHeaderItems;
-
 // Called after the editor field items have been added to the the collection
 // view model. Subclasses override this method to add items after the editor
 // fields.
@@ -35,11 +31,6 @@ const NSInteger kItemTypeEnumStart = kItemTypeEnumZero + 100;
 // text field.
 - (NSIndexPath*)indexPathForCurrentTextField;
 
-// Adds an error message item in the section |sectionIdentifier| if
-// |errorMessage| is non-empty. Otherwise removes such an item if one exists.
-- (void)addOrRemoveErrorMessage:(NSString*)errorMessage
-        inSectionWithIdentifier:(NSInteger)sectionIdentifier;
-
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_EDIT_VIEW_CONTROLLER_INTERNAL_H_