Remove all references to GYP

webrtc/build/ios/objc_app.gypi

-# Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-# Include this .gypi in an ObjC target's definition to allow it to be
-# used as an iOS or OS/X application.
-
-{
-  'variables': {
-    'infoplist_file': './objc_app.plist',
-  },
-  'dependencies': [
-    '<(webrtc_root)/system_wrappers/system_wrappers.gyp:field_trial_default',
-    '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
-  ],
-  'mac_bundle': 1,
-  'mac_bundle_resources': [
-    '<(infoplist_file)',
-  ],
-  # The plist is listed above so that it appears in XCode's file list,
-  # but we don't actually want to bundle it.
-  'mac_bundle_resources!': [
-    '<(infoplist_file)',
-  ],
-  'xcode_settings': {
-    'CLANG_ENABLE_OBJC_ARC': 'YES',
-    'INFOPLIST_FILE': '<(infoplist_file)',
-  },
-}