Remove dead GYP target audio_device_module_java

webrtc/modules/modules_java.gyp

-# 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'audio_device_module_java',
-      'type': 'none',
-      'variables': {
-        'java_in_dir': 'audio_device/android/java',
-        'additional_src_dirs': [ '../base/java/src', ],
-      },
-
-      'includes': [ '../../build/java.gypi' ],
-    }, # audio_device_module_java
-  ],
-}