Cast:Adding cast_transport_config and cleaning up

media/cast/transport/cast_transport.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'include_tests%': 1,
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'cast_transport',
       'type': 'static_library',
       'include_dirs': [
         '<(DEPTH)/',
       ],
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/net/net.gyp:net',
       ],
       'sources': [
+        'cast_transport_config.cc',
+        'cast_transport_config.h', 
         'cast_transport_defines.h', 
         'cast_transport_sender.h',
         'pacing/paced_sender.cc',
         'pacing/paced_sender.h',
         'rtcp/rtcp_builder.cc',
         'rtcp/rtcp_builder.h',
         'rtp_sender/packet_storage/packet_storage.cc',
         'rtp_sender/packet_storage/packet_storage.h',
         'rtp_sender/rtp_packetizer/rtp_packetizer.cc',
         'rtp_sender/rtp_packetizer/rtp_packetizer.h',
         'rtp_sender/rtp_sender.cc',
         'rtp_sender/rtp_sender.h',
         'transport/transport.cc',
         'transport/transport.h',
       ], # source
     },
   ],  # targets,
 }