Remove GYP files.

third_party/expat/expat_nacl.gyp

-# Copyright 2014 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.
-
-{
-  'includes': [
-    '../../native_client/build/untrusted.gypi',
-  ],
-  'targets': [
-    {
-      'target_name': 'expat_nacl',
-      'type': 'none',
-      'variables': {
-        'nlib_target': 'libexpat_nacl.a',
-        'build_glibc': 0,
-        'build_newlib': 0,
-        'build_pnacl_newlib': 1,
-      },
-      'sources': [
-        'files/lib/expat.h',
-        'files/lib/xmlparse.c',
-        'files/lib/xmlrole.c',
-        'files/lib/xmltok.c',
-      ],
-      'include_dirs': [
-        'files/lib',
-      ],
-      'defines': [
-        '_LIB',
-        'XML_STATIC',
-        'HAVE_MEMMOVE',
-      ],
-      'compile_flags': [
-        '-Wno-enum-conversion',
-        '-Wno-switch',
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          'files/lib'
-        ],
-        'defines': [
-          'XML_STATIC',  # Tell dependants to expect static linkage.
-        ],
-      },
-    },
-  ],
-}