Moved transport_adapter.h/.cc from call/ to video/ dir to remove circular dependency

webrtc/call/webrtc_call.gypi

 # Copyright (c) 2013 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.
 {
   'variables': {
     'webrtc_call_dependencies': [
       '<(webrtc_root)/common.gyp:webrtc_common',
       '<(webrtc_root)/modules/modules.gyp:congestion_controller',
       '<(webrtc_root)/modules/modules.gyp:rtp_rtcp',
       '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       '<(webrtc_root)/webrtc.gyp:rtc_event_log_impl',
     ],
     'webrtc_call_sources': [
       'call/bitrate_allocator.cc',
       'call/call.cc',
       'call/flexfec_receive_stream.cc',
       'call/flexfec_receive_stream.h',
-      'call/transport_adapter.cc',
-      'call/transport_adapter.h',
+      '../video/transport_adapter.cc',
+      '../video/transport_adapter.h',
     ],
   },
 }