Revert of HttpServer: avoid DCHECK'ing on non-HTTP/1.1 requests.

net/http/http_response_headers.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_RESPONSE_HEADERS_H_
 #define NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 317 matching lines @@
   // The members of this structure point into raw_headers_.
   struct ParsedHeader;
   typedef std::vector<ParsedHeader> HeaderList;
 
   HttpResponseHeaders();
   ~HttpResponseHeaders();
 
   // Initializes from the given raw headers.
   void Parse(const std::string& raw_input);
 
+  // Helper function for ParseStatusLine.
+  // Tries to extract the "HTTP/X.Y" from a status line formatted like:
+  //    HTTP/1.1 200 OK
+  // with line_begin and end pointing at the begin and end of this line.  If the
+  // status line is malformed, returns HttpVersion(0,0).
+  static HttpVersion ParseVersion(std::string::const_iterator line_begin,
+                                  std::string::const_iterator line_end);
+
   // Tries to extract the status line from a header block, given the first
   // line of said header block.  If the status line is malformed, we'll
   // construct a valid one.  Example input:
   //    HTTP/1.1 200 OK
   // with line_begin and end pointing at the begin and end of this line.
   // Output will be a normalized version of this.
   void ParseStatusLine(std::string::const_iterator line_begin,
                        std::string::const_iterator line_end,
                        bool has_headers);
 
@@ skipping 69 matching lines @@
 
   // The parsed http version number (not normalized).
   HttpVersion parsed_http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_