Delete unused file sessionid.h.

webrtc/p2p/p2p.gyp

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 28 matching lines @@
         'base/portallocator.h',
         'base/portinterface.h',
         'base/pseudotcp.cc',
         'base/pseudotcp.h',
         'base/relayport.cc',
         'base/relayport.h',
         'base/session.cc',
         'base/session.h',
         'base/sessiondescription.cc',
         'base/sessiondescription.h',
-        'base/sessionid.h',
         'base/stun.cc',
         'base/stun.h',
         'base/stunport.cc',
         'base/stunport.h',
         'base/stunrequest.cc',
         'base/stunrequest.h',
         'base/tcpport.cc',
         'base/tcpport.h',
         'base/transport.cc',
         'base/transport.h',
@@ skipping 77 matching lines @@
         'libstunprober',
         'rtc_p2p'
       ],
       'sources': [
         'stunprober/main.cc',
       ],
     },
   ],  # targets
 }