Remove all .gyp and .gypi files.

build/linux/unbundle/libxml.gyp

-# Copyright 2013 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': 'libxml',
-      'type': 'static_library',
-      'sources': [
-        'chromium/libxml_utils.h',
-        'chromium/libxml_utils.cc',
-      ],
-      'cflags': [
-        '<!@(pkg-config --cflags libxml-2.0)',
-      ],
-      'defines': [
-        'USE_SYSTEM_LIBXML',
-      ],
-      'direct_dependent_settings': {
-        'cflags': [
-          '<!@(pkg-config --cflags libxml-2.0)',
-        ],
-        'defines': [
-          'USE_SYSTEM_LIBXML',
-        ],
-      },
-      'link_settings': {
-        'ldflags': [
-          '<!@(pkg-config --libs-only-L --libs-only-other libxml-2.0)',
-        ],
-        'libraries': [
-          '<!@(pkg-config --libs-only-l libxml-2.0)',
-        ],
-      },
-    },
-  ],
-}