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

net/spdy/spdy_framer.h

Index: net/spdy/spdy_framer.h
diff --git a/net/spdy/spdy_framer.h b/net/spdy/spdy_framer.h
index 7ade08012e05d3573d6266281da86669c494ce35..a2ff3ab31211efe6225732ed280ef2f29d6941ed 100644
--- a/net/spdy/spdy_framer.h
+++ b/net/spdy/spdy_framer.h
@@ -736,9 +736,6 @@ class NET_EXPORT_PRIVATE SpdyFramer {
   // 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.