Fix kDataFlagsMask, which I missed in an earlier CL.

net/spdy/spdy_bitmasks.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_BITMASKS_H_
 #define NET_SPDY_SPDY_BITMASKS_H_
 #pragma once
 
 namespace net {
 
 // StreamId mask from the SpdyHeader
 const unsigned int kStreamIdMask = 0x7fffffff;
 
 // Control flag mask from the SpdyHeader
 const unsigned int kControlFlagMask = 0x8000;
 
 // Priority mask from the SYN_FRAME
 const unsigned int kSpdy3PriorityMask = 0xe0;
 const unsigned int kSpdy2PriorityMask = 0xc0;
 
 // Mask the lower 24 bits.
 const unsigned int kLengthMask = 0xffffff;
 
 // Legal flags on data packets.
-const int kDataFlagsMask = 0x03;
+const int kDataFlagsMask = 0x01;
 
 // Legal flags on control packets.
 const int kControlFlagsMask = 0x03;
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_BITMASKS_H_