Remove all .gyp and .gypi files.

build/linux/unbundle/expat.gyp

Index: build/linux/unbundle/expat.gyp
diff --git a/build/linux/unbundle/expat.gyp b/build/linux/unbundle/expat.gyp
deleted file mode 100644
index 030fb856bb75da87f215d2ca6d501499ea855180..0000000000000000000000000000000000000000
--- a/build/linux/unbundle/expat.gyp
+++ /dev/null
@@ -1,17 +0,0 @@
-# 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': 'expat',
-      'type': 'none',
-      'link_settings': {
-        'libraries': [
-          '-lexpat',
-        ],
-      },
-    },
-  ],
-}