Cleanup: Remove unused ui::ResourceBundle::ImageRTL

ui/base/resource/resource_bundle_ios.mm

Index: ui/base/resource/resource_bundle_ios.mm
diff --git a/ui/base/resource/resource_bundle_ios.mm b/ui/base/resource/resource_bundle_ios.mm
index 88cf829c6dd8c360d7079fddb4c77fe8e351f7b4..17f1c79ac07f436b798761c53560d13fd47514ac 100644
--- a/ui/base/resource/resource_bundle_ios.mm
+++ b/ui/base/resource/resource_bundle_ios.mm
@@ -89,10 +89,7 @@ base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
   return locale_file_path;
 }
 
-gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
-  // Flipped images are not used on iOS.
-  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_);
@@ -104,7 +101,7 @@ gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
 
   gfx::Image image;
   if (delegate_)
-    image = delegate_->GetNativeImageNamed(resource_id, rtl);
+    image = delegate_->GetNativeImageNamed(resource_id);
 
   if (image.IsEmpty()) {
     // Load the raw data from the resource pack at the current supported scale