Factor iOS native image loading into a utility function.

ios/chrome/browser/ui/autofill/cells/storage_switch_item.mm

 // Copyright 2016 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/autofill/cells/storage_switch_item.h"
 
 #include "components/grit/components_scaled_resources.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
 #import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ui/base/l10n/l10n_util_mac.h"
-#include "ui/base/resource/resource_bundle.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 // Padding used on the leading and trailing edges of the cell.
 const CGFloat kHorizontalPadding = 16;
 // Padding used on the top and bottom edges of the cell.
 const CGFloat kVerticalPadding = 16;
@@ skipping 53 matching lines @@
         [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:14];
     _textLabel.textColor = [[MDCPalette greyPalette] tint500];
     _textLabel.numberOfLines = 0;
     [_textLabel
         setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
                                         forAxis:
                                             UILayoutConstraintAxisHorizontal];
 
     _switchView.onTintColor = [[MDCPalette cr_bluePalette] tint500];
 
-    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-    UIImage* highlightedImage =
-        rb.GetNativeImageNamed(IDR_AUTOFILL_TOOLTIP_ICON_H).ToUIImage();
-    [_tooltipButton setImage:highlightedImage forState:UIControlStateSelected];
-    UIImage* normalImage =
-        rb.GetNativeImageNamed(IDR_AUTOFILL_TOOLTIP_ICON).ToUIImage();
-    [_tooltipButton setImage:normalImage forState:UIControlStateNormal];
+    [_tooltipButton setImage:NativeImage(IDR_AUTOFILL_TOOLTIP_ICON_H)
+                    forState:UIControlStateSelected];
+    [_tooltipButton setImage:NativeImage(IDR_AUTOFILL_TOOLTIP_ICON)
+                    forState:UIControlStateNormal];
 
     // Set up the constraints.
     [NSLayoutConstraint activateConstraints:@[
       [_textLabel.topAnchor constraintEqualToAnchor:contentView.topAnchor
                                            constant:kVerticalPadding],
       [_textLabel.bottomAnchor constraintEqualToAnchor:contentView.bottomAnchor
                                               constant:-kVerticalPadding],
       [_textLabel.leadingAnchor
           constraintEqualToAnchor:contentView.leadingAnchor
                          constant:kHorizontalPadding],
@@ skipping 36 matching lines @@
   [super prepareForReuse];
   [self.tooltipButton removeTarget:nil
                             action:nil
                   forControlEvents:self.tooltipButton.allControlEvents];
   [self.switchView removeTarget:nil
                          action:nil
                forControlEvents:self.switchView.allControlEvents];
 }
 
 @end