Fix mistake in dummy videotracksource.cc and h

webrtc/api/api.gyp

 # Copyright (c) 2015 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 297 matching lines @@
         'statstypes.h',
         'streamcollection.h',
         'videocapturertracksource.cc',
         'videocapturertracksource.h',
         'videosourceinterface.h',
         'videosourceproxy.h',
         'videotrack.cc',
         'videotrack.h',
         'videotrackrenderers.cc',
         'videotrackrenderers.h',
+        'videotracksource.cc',
+        'videotracksource.h',
         'webrtcsdp.cc',
         'webrtcsdp.h',
         'webrtcsession.cc',
         'webrtcsession.h',
         'webrtcsessiondescriptionfactory.cc',
         'webrtcsessiondescriptionfactory.h',
       ],
       # TODO(kjellander): Make the code compile without disabling these flags.
       # See https://bugs.chromium.org/p/webrtc/issues/detail?id=3307
       'cflags': [
@@ skipping 30 matching lines @@
               'AdditionalOptions': [
                 '-Wno-sign-compare',
               ],
             },
           },
         }],
       ],
     },  # target libjingle_peerconnection
   ],  # targets
 }