Remove GYP files.

url/ipc/url_ipc.gyp

-# 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.
-
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'targets': [
-     {
-      # GN version: //url/ipc
-      'target_name': 'url_ipc',
-      'type': '<(component)',
-      'dependencies': [
-        '../../base/base.gyp:base',
-        '../../ipc/ipc.gyp:ipc',
-        '../../url/url.gyp:url_lib',
-      ],
-      'defines': [ 'URL_IPC_IMPLEMENTATION' ],
-      'include_dirs': [
-        '../..',
-      ],
-      'sources': [
-        'url_ipc_export.h',
-        'url_param_traits.cc',
-        'url_param_traits.h',
-      ],
-    },
-    {
-      'target_name': 'url_ipc_unittests',
-      'type': 'executable',
-      'dependencies': [
-        '../../base/base.gyp:run_all_unittests',
-        '../../ipc/ipc.gyp:test_support_ipc',
-        '../../testing/gtest.gyp:gtest',
-        '../url.gyp:url_lib',
-        'url_ipc',
-      ],
-      'sources': [ 'url_param_traits_unittest.cc' ],
-    },
-  ],
-}