Cleanup: Remove unused ui::ResourceBundle::ImageRTL

ui/base/resource/resource_bundle_android.cc

Index: ui/base/resource/resource_bundle_android.cc
diff --git a/ui/base/resource/resource_bundle_android.cc b/ui/base/resource/resource_bundle_android.cc
index ae731d680cb4849d6fd7a78716abd52226a88196..e19a8b8301ded09040fdb5f9e764a27aada51d15 100644
--- a/ui/base/resource/resource_bundle_android.cc
+++ b/ui/base/resource/resource_bundle_android.cc
@@ -120,9 +120,7 @@ std::string ResourceBundle::LoadLocaleResources(
   return app_locale;
 }
 
-gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
-  // Flipped image is not used on Android.
-  DCHECK_EQ(rtl, RTL_DISABLED);
+gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
   return GetImageNamed(resource_id);
 }