Remove old methods in AudioTransport, make it pass a gn build

webrtc/modules/audio_device/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../../build/webrtc.gni")
 
@@ skipping 22 matching lines @@
     "../../system_wrappers",
     "../utility",
   ]
 
   sources = [
     "audio_device_buffer.cc",
     "audio_device_buffer.h",
     "audio_device_config.h",
     "audio_device_generic.cc",
     "audio_device_generic.h",
+    "audio_transport.cc",
     "dummy/audio_device_dummy.cc",
     "dummy/audio_device_dummy.h",
     "dummy/file_audio_device.cc",
     "dummy/file_audio_device.h",
     "fine_audio_buffer.cc",
     "fine_audio_buffer.h",
     "include/audio_device.h",
     "include/audio_device_defines.h",
   ]
 
@@ skipping 150 matching lines @@
     "../..:common_inherited_config",
     ":audio_device_config",
   ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }