Factor iOS native image loading into a utility function.

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

 // Copyright 2014 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/ui/bookmarks/bookmark_collection_cells.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include "base/logging.h"
 #include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_extended_button.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.h"
 #import "ios/chrome/browser/ui/rtl_geometry.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #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"
 
 namespace {
 const CGFloat kBookmarkItemCellDefaultImageSize = 40.0;
 const CGFloat kBookmarkFolderCellDefaultImageSize = 24.0;
 }  // namespace
 
 @interface BookmarkCell () {
  @protected
@@ skipping 246 matching lines @@
 }
 
 - (void)showButtonOfType:(bookmark_cell::ButtonType)buttonType
                 animated:(BOOL)animated {
   switch (buttonType) {
     case bookmark_cell::ButtonNone:
       [self removeButtonAnimated:animated];
       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;
     }
   }
 }
 
 - (void)addButtonWithImage:(UIImage*)image animated:(BOOL)animated {
   // Set the image.
   [self.button setImage:image forState:UIControlStateNormal];
 
   // Animates the button in.
@@ skipping 238 matching lines @@
   return self;
 }
 
 - (void)layoutSubviews {
   CGFloat lineHeight = 1;
   CGFloat lineY = self.bounds.size.height - lineHeight - 8;
   _lineView.frame = CGRectMake(0, lineY, self.bounds.size.width, lineHeight);
 }
 
 @end