Remove GYP files from components.

components/previews.gypi

Index: components/previews.gypi
diff --git a/components/previews.gypi b/components/previews.gypi
deleted file mode 100644
index 0839ec240d48f1d5c1067e0b299c3132d014744f..0000000000000000000000000000000000000000
--- a/components/previews.gypi
+++ /dev/null
@@ -1,24 +0,0 @@
-# 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.
-
-{
-  'targets': [
-    {
-      # GN version: //components/previews
-      'target_name': 'previews',
-      'type': 'static_library',
-      'include_dirs': [
-        '..',
-      ],
-      'dependencies': [
-        '../base/base.gyp:base',
-        'variations',
-      ],
-      'sources': [
-        'previews/previews_experiments.cc',
-        'previews/previews_experiments.h',
-      ]
-    },
-  ],
-}