Remove all .gyp and .gypi files.

build/json_to_struct.gypi

-# Copyright 2012 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.
-
-{
-  'variables': {
-    # When including this gypi, the following variables must be set:
-    #   schema_file: a json file that comprise the structure model.
-    #   namespace: the C++ namespace that all generated files go under
-    #   cc_dir: path to generated files
-    # Functions and namespaces can be excluded by setting "nocompile" to true.
-    'struct_gen_dir': '<(DEPTH)/tools/json_to_struct',
-    'struct_gen': '<(struct_gen_dir)/json_to_struct.py',
-  },
-  'rules': [
-    {
-      # GN version: //tools/json_to_struct/json_to_struct.gni
-      'rule_name': 'genstaticinit',
-      'extension': 'json',
-      'inputs': [
-        '<(struct_gen_dir)/element_generator.py',
-        '<(struct_gen_dir)/json_to_struct.py',
-        '<(struct_gen_dir)/struct_generator.py',
-        '<(schema_file)',
-      ],
-      'outputs': [
-        '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/<(RULE_INPUT_ROOT).cc',
-        '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/<(RULE_INPUT_ROOT).h',
-      ],
-      'action': [
-        'python',
-        '<(struct_gen)',
-        '<(RULE_INPUT_PATH)',
-        '--destbase=<(SHARED_INTERMEDIATE_DIR)',
-        '--destdir=<(cc_dir)',
-        '--namespace=<(namespace)',
-        '--schema=<(schema_file)',
-      ],
-      'message': 'Generating C++ static initializers from <(RULE_INPUT_PATH)',
-      'process_outputs_as_sources': 1,
-    },
-  ],
-  'include_dirs': [
-    '<(SHARED_INTERMEDIATE_DIR)',
-    '<(DEPTH)',
-  ],
-  # This target exports a hard dependency because it generates header
-  # files.
-  'hard_dependency': 1,
-}