Remove all remaining obj_int_extract code

unpack_lib_posix.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 action takes an archive (.a) file and unpacks it unto object (.o) files.
-# The following input gyp variables are required:
-#   unpack_lib_output_dir, the output directory of extracted object file
-#   unpack_lib_name, the object file to be extracted.
-#   unpack_lib_search_path_list, a list of paths to search for the library.
-#   it must be ['-a', 'path_name1', '-a', 'path_name2'...]
-#
-# For example:
-#   'variables': {
-#     'unpack_lib_search_path_list': [
-#       '-a', '/a/lib.a',
-#       '-a', 'b/lib.a',
-#     ],
-#     'unpack_lib_output_dir':'ouput',
-#     'unpack_lib_name':'offsets.o'
-#   },
-#   'includes': ['unpack_lib_posix.gypi'],
-#
-# It unpacks the first existing library in 'unpack_lib_search_path_list', and
-# extracts 'offsets.o' to 'output' directory.
-
-{
-  'actions': [
-    {
-      'variables' : {
-        'ar_cmd': [],
-        'conditions': [
-          ['android_webview_build==1', {
-            'ar_cmd': ['-r', '$(abspath $($(gyp_var_prefix)TARGET_AR))'],
-          }],
-        ],
-      },
-      'action_name': 'unpack_lib_posix',
-      'inputs': [
-        'unpack_lib_posix.sh',
-      ],
-      'outputs': [
-        '<(unpack_lib_output_dir)/<(unpack_lib_name)',
-      ],
-      'action': [
-        '<(DEPTH)/third_party/libvpx/unpack_lib_posix.sh',
-        '-d', '<(unpack_lib_output_dir)',
-        '-f', '<(unpack_lib_name)',
-        '<@(unpack_lib_search_path_list)',
-        '<@(ar_cmd)',
-      ],
-      'process_outputs_as_sources': 1,
-    },
-  ],
-}