Update SPDY4 settings ID to 16 bits (from 8).

net/spdy/spdy_protocol.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.
 
 // This file contains some protocol structures for use with SPDY 2 and 3
 // The SPDY 2 spec can be found at:
 // http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft2
 // The SPDY 3 spec can be found at:
 // http://dev.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3
 
@@ skipping 493 matching lines @@
   static size_t GetControlFrameHeaderSize(SpdyMajorVersion version);
 
   static size_t GetPrefixLength(SpdyFrameType type, SpdyMajorVersion version);
 
   static size_t GetFrameMaximumSize(SpdyMajorVersion version);
 
   // Returns the size of a header block size field. Valid only for SPDY
   // versions <= 3.
   static size_t GetSizeOfSizeField(SpdyMajorVersion version);
 
+  // Returns the size (in bytes) of a wire setting ID and value.
+  static size_t GetSettingSize(SpdyMajorVersion version);
+
   static SpdyMajorVersion ParseMajorVersion(int version_number);
 
   static int SerializeMajorVersion(SpdyMajorVersion version);
 
   static std::string GetVersionString(SpdyMajorVersion version);
 };
 
 class SpdyFrame;
 typedef SpdyFrame SpdySerializedFrame;
 
@@ skipping 517 matching lines @@
   SpdyFrameVisitor() {}
   virtual ~SpdyFrameVisitor() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SpdyFrameVisitor);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_PROTOCOL_H_