[Payment Request] Replacing more iOS strings with components strings

ios/chrome/browser/payments/shipping_option_selection_view_controller.mm

 // 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.
 
 #import "ios/chrome/browser/payments/shipping_option_selection_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/payments/core/currency_formatter.h"
@@ skipping 84 matching lines @@
 
 - (void)loadModel {
   [super loadModel];
   CollectionViewModel* model = self.collectionViewModel;
   _selectedItem = nil;
 
   [model addSectionWithIdentifier:SectionIdentifierShippingOption];
 
   if (self.pending) {
     StatusItem* statusItem = [[StatusItem alloc] initWithType:ItemTypeSpinner];
-    statusItem.text =
-        l10n_util::GetNSString(IDS_IOS_PAYMENT_REQUEST_CHECKING_LABEL);
+    statusItem.text = l10n_util::GetNSString(IDS_PAYMENTS_CHECKING_OPTION);
     [model addItem:statusItem
         toSectionWithIdentifier:SectionIdentifierShippingOption];
     return;
   }
 
   if (_errorMessage) {
     PaymentsTextItem* messageItem =
         [[PaymentsTextItem alloc] initWithType:ItemTypeMessage];
     messageItem.text = _errorMessage;
     messageItem.image = NativeImage(IDR_IOS_PAYMENTS_WARNING);
@@ skipping 120 matching lines @@
     hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
   NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
   if (type == ItemTypeMessage) {
     return YES;
   } else {
     return NO;
   }
 }
 
 @end