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

components/search_engines/template_url.h

Index: components/search_engines/template_url.h
diff --git a/components/search_engines/template_url.h b/components/search_engines/template_url.h
index 89d313afcb57db114ad4c201948617f740cbb77e..c62bd20bea689c4c5cf5f7561428e73efa1ef41d 100644
--- a/components/search_engines/template_url.h
+++ b/components/search_engines/template_url.h
@@ -522,10 +522,7 @@ class TemplateURL {
   // Generates a suitable keyword for the specified url, which must be valid.
   // This is guaranteed not to return an empty string, since TemplateURLs should
   // never have an empty keyword.
-  // |accept_languages| is a list of languages, which will be used in
-  // IDN-decoding of |url|'s hostname.
-  static base::string16 GenerateKeyword(const GURL& url,
-                                        const std::string& accept_languages);
+  static base::string16 GenerateKeyword(const GURL& url);
 
   // Generates a favicon URL from the specified url.
   static GURL GenerateFaviconURL(const GURL& url);