Factor iOS native image loading into a utility function.

ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm

Index: ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm b/ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm
index 9d7be019d491fa4bba3181fba799d738a9284362..38ea80526f47f812abd7a0d07f0106af33e32ee6 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_collection_cells.mm
@@ -19,7 +19,6 @@
 #import "ios/third_party/material_components_ios/src/components/Ink/src/MaterialInk.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
 #include "ui/base/l10n/l10n_util_mac.h"
-#include "ui/base/resource/resource_bundle.h"
 #import "ui/gfx/ios/NSString+CrStringDrawing.h"
 #include "url/gurl.h"
 
@@ -286,10 +285,8 @@ const CGFloat kBookmarkFolderCellDefaultImageSize = 24.0;
       break;
 
     case bookmark_cell::ButtonMenu: {
-      ResourceBundle& rb = ResourceBundle::GetSharedInstance();
-      UIImage* bgImage =
-          rb.GetNativeImageNamed(IDR_IOS_TOOLBAR_LIGHT_TOOLS).ToUIImage();
-      [self addButtonWithImage:bgImage animated:animated];
+      [self addButtonWithImage:NativeImage(IDR_IOS_TOOLBAR_LIGHT_TOOLS)
+                      animated:animated];
       break;
     }
   }