Remove all .gyp and .gypi files.

build/repack_action.gypi

-# Copyright 2014 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.
-
-# This file is meant to be included into an action to invoke grit repack in a
-# consistent manner. To use this the following variables need to be
-# defined:
-#   pak_inputs: list: paths of pak files that need to be combined.
-#   pak_output: string: the output pak file path.
-
-{
-  # GYP version: //tools/grit/repack.gni
-  'variables': {
-    'repack_path': '<(DEPTH)/tools/grit/grit/format/repack.py',
-    'repack_options%': [],
-  },
-  'inputs': [
-    '<(repack_path)',
-    '<@(pak_inputs)',
-  ],
-  'outputs': [
-    '<(pak_output)'
-  ],
-  'action': [
-    'python',
-    '<(repack_path)',
-    '<@(repack_options)',
-    '<(pak_output)',
-    '<@(pak_inputs)',
-  ],
-}