Remove GYP files.

third_party/libsync/libsync.gyp

Index: third_party/libsync/libsync.gyp
diff --git a/third_party/libsync/libsync.gyp b/third_party/libsync/libsync.gyp
deleted file mode 100644
index 76e191503e4960867e9f5bb5ad2395532a8b241e..0000000000000000000000000000000000000000
--- a/third_party/libsync/libsync.gyp
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-{
-  'targets': [
-    {
-      'target_name': 'libsync',
-      'type': 'static_library',
-      'sources': [
-        'include/linux/sw_sync.h',
-        'include/linux/sync.h',
-        'include/sw_sync.h',
-        'include/sync/sync.h',
-        'strlcpy.c',
-        'sync.c',
-      ],
-      'include_dirs': [
-        'include',
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          'include',
-        ],
-      },
-    },
-  ],
-}