Remove all .gyp and .gypi files.

build/linux/unbundle/re2.gyp

-# 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': 're2',
-      'type': 'none',
-      'variables': {
-        'headers_root_path': '.',
-        'header_filenames': [
-          're2/filtered_re2.h',
-          're2/re2.h',
-          're2/set.h',
-          're2/stringpiece.h',
-          're2/variadic_function.h',
-        ],
-        'shim_generator_additional_args': [
-          # Chromium copy of re2 is patched to rename POSIX to POSIX_SYNTAX
-          # because of collision issues that break the build.
-          # Upstream refuses to make changes:
-          # http://code.google.com/p/re2/issues/detail?id=73 .
-          '--define', 'POSIX=POSIX_SYNTAX',
-        ],
-      },
-      'includes': [
-        '../../build/shim_headers.gypi',
-      ],
-      'link_settings': {
-        'libraries': [
-          '-lre2',
-        ],
-      },
-    }
-  ],
-}