Use CollectionViewTextItem instead of a cast

ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm

Index: ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm
diff --git a/ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm b/ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm
index ad7ddf797d7f8dfb60de06ec8967cdf25a331c62..f690fbfe28644e2449e0cdc3f08b8a52292509d4 100644
--- a/ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm
@@ -111,6 +111,9 @@ const CGFloat kHorizontalImageFixedSize = 40;
   CollectionViewTextItem* textHeader = [
       [[CollectionViewTextItem alloc] initWithType:ItemTypeHeader] autorelease];
   textHeader.text = @"MDCCollectionViewTextCell";
+  textHeader.textFont =
+      [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:14];

[lpromero, 2017/03/24 09:28:24]

MDCTypography got updated recently to have medium fonts too. Can you look if you
can migrate to it?

[gambard, 2017/03/24 09:49:03]

Done.

+  textHeader.textColor = [[MDCPalette greyPalette] tint500];
   [model setHeader:textHeader
       forSectionWithIdentifier:SectionIdentifierTextCell];
 
@@ -329,25 +332,6 @@ const CGFloat kHorizontalImageFixedSize = 40;
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
 }
 
-#pragma mark UICollectionViewDataSource
-
-- (UICollectionReusableView*)collectionView:(UICollectionView*)collectionView
-          viewForSupplementaryElementOfKind:(NSString*)kind
-                                atIndexPath:(NSIndexPath*)indexPath {
-  UICollectionReusableView* cell = [super collectionView:collectionView
-                       viewForSupplementaryElementOfKind:kind
-                                             atIndexPath:indexPath];
-  MDCCollectionViewTextCell* textCell =
-      base::mac::ObjCCast<MDCCollectionViewTextCell>(cell);
-  if (textCell) {
-    textCell.textLabel.font =
-        [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:14];
-    textCell.textLabel.textColor = [[MDCPalette greyPalette] tint500];
-  }
-
-  return cell;
-};
-
 #pragma mark MDCCollectionViewStylingDelegate
 
 - (CGFloat)collectionView:(nonnull UICollectionView*)collectionView