Remove all gyp[i] files in //chrome

chrome/common/variations/fieldtrial_testing_config.gyp

-# Copyright 2015 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': [
-    {
-      # GN version: //chrome/common/variations:fieldtrial_testing_config
-      'target_name': 'fieldtrial_testing_config',
-      'type': 'static_library',
-      'sources': [
-        '../../../testing/variations/fieldtrial_testing_config_android.json',
-        '../../../testing/variations/fieldtrial_testing_config_win.json',
-        '../../../testing/variations/fieldtrial_testing_config_linux.json',
-        '../../../testing/variations/fieldtrial_testing_config_mac.json',
-        '../../../testing/variations/fieldtrial_testing_config_chromeos.json',
-        '../../../testing/variations/fieldtrial_testing_config_ios.json',
-      ],
-      'conditions': [
-        ['OS!="android"', {'sources/': [['exclude', '_android\\.json$']]}],
-        ['OS!="win"', {'sources/': [['exclude', '_win\\.json$']]}],
-        ['OS!="linux" or chromeos==1', {'sources/': [['exclude', '_linux\\.json$']]}],
-        ['OS!="mac"', {'sources/': [['exclude', '_mac\\.json$']]}],
-        ['chromeos!=1', {'sources/': [['exclude', '_chromeos\\.json$']]}],
-        ['OS!="ios"', {'sources/': [['exclude', '_ios\\.json$']]}],
-      ],
-      'includes': [
-        '../../../build/json_to_struct.gypi',
-      ],
-      'variables': {
-        'chromium_code': 1,
-        'schema_file': 'fieldtrial_testing_config_schema.json',
-        'namespace': 'chrome_variations',
-        'cc_dir': 'chrome/common/variations',
-        'struct_gen': '<(DEPTH)/tools/variations/fieldtrial_to_struct.py',
-        'output_filename': 'fieldtrial_testing_config',
-      },
-    },
-  ],
-}