Cleanup: Remove unused ui::ResourceBundle::ImageRTL

ui/base/resource/resource_bundle_auralinux.cc

 // 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"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_handle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/image/image.h"
 
 namespace ui {
 
 void ResourceBundle::LoadCommonResources() {
   LoadChromeResources();
 }
 
-gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
-  // Flipped image is not used on ChromeOS.
-  DCHECK_EQ(rtl, RTL_DISABLED);
+gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
   return GetImageNamed(resource_id);
 }
 
 }  // namespace ui