Deprecate HTTP/2 PAD_HIGH field and enforce max padding size to 256 octets.

net/spdy/spdy_framer.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_SPDY_SPDY_FRAMER_H_
 #define NET_SPDY_SPDY_FRAMER_H_
 
 #include <list>
 #include <map>
 #include <memory>
@@ skipping 718 matching lines @@
   SpdyError error_code_;
 
   // Note that for DATA frame, remaining_data_length_ is sum of lengths of
   // frame header, padding length field (optional), data payload (optional) and
   // padding payload (optional).
   size_t remaining_data_length_;
 
   // The length (in bytes) of the padding payload to be processed.
   size_t remaining_padding_payload_length_;
 
-  // The length (in bytes) of the padding length field to be processed.
-  size_t remaining_padding_length_fields_;
-
   // The number of bytes remaining to read from the current control frame's
   // headers. Note that header data blocks (for control types that have them)
   // are part of the frame's payload, and not the frame's headers.
   size_t remaining_control_header_;
 
   scoped_ptr<char[]> current_frame_buffer_;
   // Number of bytes read into the current_frame_buffer_.
   size_t current_frame_buffer_length_;
 
   // The type of the frame currently being read.
@@ skipping 55 matching lines @@
   // If a HEADERS frame is followed by a CONTINUATION frame, the FIN/END_STREAM
   // flag is still carried in the HEADERS frame. If it's set, flip this so that
   // we know to terminate the stream when the entire header block has been
   // processed.
   bool end_stream_when_done_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_FRAMER_H_