Update two obsolete RFC references.

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 <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
   static void ParseContentType(const std::string& content_type_str,
                                std::string* mime_type,
                                std::string* charset,
                                bool* had_charset,
                                std::string* boundary);
 
   // Scans the headers and look for the first "Range" header in |headers|,
   // if "Range" exists and the first one of it is well formatted then returns
   // true, |ranges| will contain a list of valid ranges. If return
   // value is false then values in |ranges| should not be used. The format of
-  // "Range" header is defined in RFC 2616 Section 14.35.1.
-  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.1
+  // "Range" header is defined in RFC 7233 Section 2.1.
+  // https://tools.ietf.org/html/rfc7233#section-2.1
   static bool ParseRanges(const std::string& headers,
                           std::vector<HttpByteRange>* ranges);
 
   // Same thing as ParseRanges except the Range header is known and its value
   // is directly passed in, rather than requiring searching through a string.
   static bool ParseRangeHeader(const std::string& range_specifier,
                                std::vector<HttpByteRange>* ranges);
 
   // 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.
@@ skipping 279 matching lines @@
     // into the original's unquoted_value_ member.
     std::string unquoted_value_;
 
     bool value_is_quoted_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_