Hide the ink for the custom-design cells

ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

Index: ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm b/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm
index 45428e1b425488a742e17cf13541247740cd4702..5e776fdc2e96958c221b42baccac095fae8a383e 100644
--- a/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm
+++ b/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm
@@ -191,6 +191,17 @@ using CSCollectionViewItem = CollectionViewItem<SuggestedContent>;
 
 #pragma mark - MDCCollectionViewStylingDelegate
 
+// TODO(crbug.com/724493): Use collectionView:hidesInkViewAtIndexPath: when it
+// is fixed. For now hidding the ink prevent cell interaction.
+- (UIColor*)collectionView:(UICollectionView*)collectionView
+       inkColorAtIndexPath:(NSIndexPath*)indexPath {
+  if ([self.collectionUpdater
+          shouldUseCustomStyleForSection:indexPath.section]) {
+    return [UIColor clearColor];
+  }
+  return nil;
+}
+
 - (UIColor*)collectionView:(nonnull UICollectionView*)collectionView
     cellBackgroundColorAtIndexPath:(nonnull NSIndexPath*)indexPath {
   if ([self.collectionUpdater