Delete empty API files and cleaned up includes.

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 281 matching lines @@
         'peerconnection.cc',
         'peerconnection.h',
         'peerconnectionfactory.cc',
         'peerconnectionfactory.h',
         'peerconnectionfactoryproxy.h',
         'peerconnectioninterface.h',
         'peerconnectionproxy.h',
         'proxy.h',
         'remoteaudiosource.cc',
         'remoteaudiosource.h',
-        'remotevideocapturer.cc',
-        'remotevideocapturer.h',
         'rtpparameters.h',
         'rtpreceiver.cc',
         'rtpreceiver.h',
         'rtpreceiverinterface.h',
         'rtpsender.cc',
         'rtpsender.h',
         'rtpsenderinterface.h',
         'sctputils.cc',
         'sctputils.h',
         'statscollector.cc',
         'statscollector.h',
         'statstypes.cc',
         'statstypes.h',
         'streamcollection.h',
         'videocapturertracksource.cc',
         'videocapturertracksource.h',
-        'videosourceinterface.h',
         'videosourceproxy.h',
         'videotrack.cc',
         'videotrack.h',
         'videotracksource.cc',
         'videotracksource.h',
         'webrtcsdp.cc',
         'webrtcsdp.h',
         'webrtcsession.cc',
         'webrtcsession.h',
         'webrtcsessiondescriptionfactory.cc',
@@ skipping 35 matching lines @@
               'AdditionalOptions': [
                 '-Wno-sign-compare',
               ],
             },
           },
         }],
       ],
     },  # target libjingle_peerconnection
   ],  # targets
 }