Remove all references to GYP

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',
-      'video/transport_adapter.cc',
-      'video/transport_adapter.h',
-    ],
-  },
-}