net: remove AppendHeaderIfMissing() from HttpUtil

net/http/http_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_UTIL_H_
 #define NET_HTTP_HTTP_UTIL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 56 matching lines @@
 
   // Parses a Retry-After header that is either an absolute date/time or a
   // number of seconds in the future. Interprets absolute times as relative to
   // |now|. If |retry_after_string| is successfully parsed and indicates a time
   // that is not in the past, fills in |*retry_after| and returns true;
   // otherwise, returns false.
   static bool ParseRetryAfterHeader(const std::string& retry_after_string,
                                     base::Time now,
                                     base::TimeDelta* retry_after);
 
-  // Scans the '\r\n'-delimited headers for the given header name.  Returns
-  // true if a match is found.  Input is assumed to be well-formed.
-  // TODO(darin): kill this
-  static bool HasHeader(const std::string& headers, const char* name);
-
   // Returns true if it is safe to allow users and scripts to specify the header
   // named |name|.
   static bool IsSafeHeader(const std::string& name);
 
   // Returns true if |name| is a valid HTTP header name.
   static bool IsValidHeaderName(const base::StringPiece& name);
 
   // Returns false if |value| contains NUL or CRLF. This method does not perform
   // a fully RFC-2616-compliant header value validation.
   static bool IsValidHeaderValue(const base::StringPiece& value);
@@ skipping 111 matching lines @@
   // means q=1.0.
   //
   // When making a http request, this should be used to determine what
   // to put in Accept-Language header. If a comma separated list of language
   // codes *without* qvalue is sent, web servers regard all
   // of them as having q=1.0 and pick one of them even though it may not
   // be at the beginning of the list (see http://crbug.com/5899).
   static std::string GenerateAcceptLanguageHeader(
       const std::string& raw_language_list);
 
-  // Helper. If |*headers| already contains |header_name| do nothing,
-  // otherwise add <header_name> ": " <header_value> to the end of the list.
-  static void AppendHeaderIfMissing(const char* header_name,
-                                    const std::string& header_value,
-                                    std::string* headers);
-
   // Returns true if the parameters describe a response with a strong etag or
   // last-modified header.  See section 13.3.3 of RFC 2616.
   // An empty string should be passed for missing headers.
   static bool HasStrongValidators(HttpVersion version,
                                   const std::string& etag_header,
                                   const std::string& last_modified_header,
                                   const std::string& date_header);
 
   // Returns true if this response has any validator (either a Last-Modified or
   // an ETag) regardless of whether it is strong or weak.  See section 13.3.3 of
@@ skipping 207 matching lines @@
     // True if quotes values are required to be properly quoted; false if
     // mismatched quotes and other problems with quoted values should be more
     // or less gracefully treated as valid.
     bool strict_quotes_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_