Remove all references to GYP

webrtc/api/api_java.gyp

-# Copyright (c) 2016 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.
-
-# This file exists only because there's no other way to avoid errors in the
-# Chromium build due to the inclusion of build/java.gypi. GYP unfortunately
-# processes all 'includes' for all .gyp files, ignoring conditions. This
-# processing takes place early in the cycle, before it's possible to use
-# variables. It will go away when WebRTC has fully migrated to GN.
-
-{
-  'includes': [ '../build/common.gypi', ],
-  'conditions': [
-    ['OS=="android"', {
-      'targets': [
-        {
-          # |libjingle_peerconnection_java| builds a jar file with name
-          # libjingle_peerconnection_java.jar using Chrome's build system.
-          # It includes all Java files needed to setup a PeeerConnection call
-          # from Android.
-          'target_name': 'libjingle_peerconnection_java',
-          'type': 'none',
-          'dependencies': [
-            '<(webrtc_root)/api/api.gyp:libjingle_peerconnection_so',
-          ],
-          'variables': {
-            # Designate as Chromium code and point to our lint settings to
-            # enable linting of the WebRTC code (this is the only way to make
-            # lint_action invoke the Android linter).
-            'android_manifest_path': '<(webrtc_root)/build/android/AndroidManifest.xml',
-            'suppressions_file': '<(webrtc_root)/build/android/suppressions.xml',
-            'chromium_code': 1,
-            'java_in_dir': 'android/java',
-            'webrtc_base_dir': '<(webrtc_root)/base',
-            'webrtc_modules_dir': '<(webrtc_root)/modules',
-            'additional_src_dirs' : [
-              '<(webrtc_base_dir)/java',
-              '<(webrtc_modules_dir)/audio_device/android/java/src',
-            ],
-          },
-          'includes': ['../../build/java.gypi'],
-        },
-      ],  # targets
-    }],  # OS=="android"
-  ],  # conditions
-}