Drop |languages| from {Format,Elide}Url* and IDNToUnicode

ios/web/public/navigation_item.h

Index: ios/web/public/navigation_item.h
diff --git a/ios/web/public/navigation_item.h b/ios/web/public/navigation_item.h
index 7d8de13c3fd8ac08b917342ce7db0f2e1781ca7e..d84240b1331fdfad00d303019f500c0f338916a8 100644
--- a/ios/web/public/navigation_item.h
+++ b/ios/web/public/navigation_item.h
@@ -71,11 +71,8 @@ class NavigationItem : public base::SupportsUserData {
   // Page-related helpers ------------------------------------------------------
 
   // Returns the title to be displayed on the tab. This could be the title of
-  // the page if it is available or the URL. |languages| is the list of
-  // accepted languages (e.g., prefs::kAcceptLanguages) or empty if proper
-  // URL formatting isn't needed (e.g., unit tests).
-  virtual const base::string16& GetTitleForDisplay(
-      const std::string& languages) const = 0;
+  // the page if it is available or the URL.
+  virtual const base::string16& GetTitleForDisplay() const = 0;
 
   // Tracking stuff ------------------------------------------------------------