net: don't preserve 1xx responses in parser buffer.

net/http/http_stream_parser.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_STREAM_PARSER_H_
 #define NET_HTTP_HTTP_STREAM_PARSER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 160 matching lines @@
   // The request to send.
   const HttpRequestInfo* request_;
 
   // The request header data.
   scoped_refptr<DrainableIOBuffer> request_headers_;
 
   // Temporary buffer for reading.
   scoped_refptr<GrowableIOBuffer> read_buf_;
 
   // Offset of the first unused byte in |read_buf_|.  May be nonzero due to
-  // a 1xx header, or body data in the same packet as header data.
+  // body data in the same packet as header data but is zero when reading
+  // headers.
   int read_buf_unused_offset_;
 
   // The amount beyond |read_buf_unused_offset_| where the status line starts;
   // -1 if not found yet.
   int response_header_start_offset_;
 
   // The parsed response headers.  Owned by the caller.
   HttpResponseInfo* response_;
 
   // Indicates the content length.  If this value is less than zero
@@ skipping 37 matching lines @@
   bool sent_last_chunk_;
 
   base::WeakPtrFactory<HttpStreamParser> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamParser);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_PARSER_H_