Remove all references to GYP

webrtc/system_wrappers/cpu_features_chromium.gyp

-# Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-{
-  'conditions': [
-    ['OS=="android"', {
-      'targets': [
-        {
-          'target_name': 'cpu_features_android',
-          'type': 'static_library',
-          'sources': [
-            'source/cpu_features_android.c',
-          ],
-          'dependencies': [
-            '../../../build/android/ndk.gyp:cpu_features',
-          ],
-        },
-      ],
-    }],
-  ], # conditions
-}