Cleanup: Remove unused ui::ResourceBundle::ImageRTL

ui/base/resource/resource_bundle_mac.mm

 // Copyright (c) 2012 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.
 
 #include "ui/base/resource/resource_bundle.h"
 
 #import <AppKit/AppKit.h>
 #include <stddef.h>
 
 #include "base/files/file_path.h"
@@ skipping 86 matching lines @@
   // Don't try to load empty values or values that are not absolute paths.
   if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
     return base::FilePath();
 
   if (test_file_exists && !base::PathExists(locale_file_path))
     return base::FilePath();
 
   return locale_file_path;
 }
 
-gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
-  // Flipped images are not used on Mac.
-  DCHECK_EQ(rtl, RTL_DISABLED);
-
+gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
   // Check to see if the image is already in the cache.
   {
     base::AutoLock lock(*images_and_fonts_lock_);
     if (images_.count(resource_id)) {
       if (!images_[resource_id].HasRepresentation(gfx::Image::kImageRepCocoa)) {
         DLOG(WARNING) << "ResourceBundle::GetNativeImageNamed() is returning a"
           << " cached gfx::Image that isn't backed by an NSImage. The image"
           << " will be converted, rather than going through the NSImage loader."
           << " resource_id = " << resource_id;
       }
       return images_[resource_id];
     }
   }
 
   gfx::Image image;
   if (delegate_)
-    image = delegate_->GetNativeImageNamed(resource_id, rtl);
+    image = delegate_->GetNativeImageNamed(resource_id);
 
   bool found_in_a_material_design_pack = false;
 
   if (image.IsEmpty()) {
     base::scoped_nsobject<NSImage> ns_image;
     for (size_t i = 0; i < data_packs_.size(); ++i) {
       scoped_refptr<base::RefCountedStaticMemory> data(
           data_packs_[i]->GetStaticMemory(resource_id));
       if (!data.get())
         continue;
@@ skipping 34 matching lines @@
 
   // Another thread raced the load and has already cached the image.
   if (images_.count(resource_id))
     return images_[resource_id];
 
   images_[resource_id] = image;
   return images_[resource_id];
 }
 
 }  // namespace ui