Delete unused file screencastid.h.

webrtc/media/media.gyp

 # Copyright (c) 2016 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/mediaconstants.cc',
         'base/mediaconstants.h',
         'base/mediaengine.cc',
         'base/mediaengine.h',
         'base/rtpdataengine.cc',
         'base/rtpdataengine.h',
         'base/rtpdump.cc',
         'base/rtpdump.h',
         'base/rtputils.cc',
         'base/rtputils.h',
-        'base/screencastid.h',
         'base/streamparams.cc',
         'base/streamparams.h',
         'base/turnutils.cc',
         'base/turnutils.h',
         'base/videoadapter.cc',
         'base/videoadapter.h',
         'base/videobroadcaster.cc',
         'base/videobroadcaster.h',
         'base/videocapturer.cc',
         'base/videocapturer.h',
@@ skipping 103 matching lines @@
                 'gdi32.lib',
                 'strmiids.lib',
               ],
             },
           },
         }],
       ],
     },  # target rtc_media
   ],  # targets.
 }