remove unnecessary duplicate_name method

include/ada/url_pattern_helpers-inl.h

@@ -618,7 +618,8 @@ std::optional<url_pattern_errors> url_pattern_parser<F>::add_part(
   }
   // If the result of running is a duplicate name given parser and name is
   // true, then throw a TypeError.
-  if (is_duplicate_name(name)) {
+  if (std::ranges::any_of(
+          parts, [&name](const auto& part) { return part.name == name; })) {
     return url_pattern_errors::type_error;
   }
   // Let encoded prefix be the result of running parser’s encoding callback
@@ -638,14 +639,6 @@ std::optional<url_pattern_errors> url_pattern_parser<F>::add_part(
   return std::nullopt;
 }
 
-template <url_pattern_encoding_callback F>
-bool url_pattern_parser<F>::is_duplicate_name(std::string_view name) {
-  // For each part of parser’s part list:
-  // If part’s name is name, then return true.
-  return std::ranges::any_of(
-      parts, [&name](const auto& part) { return part.name == name; });
-}
-
 template <url_pattern_encoding_callback F>
 tl::expected<std::vector<url_pattern_part>, url_pattern_errors>
 parse_pattern_string(std::string_view input,

include/ada/url_pattern_helpers.h

@@ -79,8 +79,6 @@ class url_pattern_parser {
       std::string_view prefix, Token* name_token,
       Token* regexp_or_wildcard_token, std::string_view suyffix,
       Token* modifier_token) ada_warn_unused;
-  // @see https://urlpattern.spec.whatwg.org/#is-a-duplicate-name
-  bool is_duplicate_name(std::string_view name);
 
   std::vector<Token> tokens{};
   F& encoding_callback;