Remove Android tests GYP target.

webrtc/build/android_tests_noop.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.
-
-# See webrtc/build/android_tests.gyp for more information about this file.
-{
-  'targets': [
-    {
-      'target_name': 'android_junit_tests',
-      'type': 'none',
-    },
-  ],
-}