Removes files from //build that we don't need

build/config/ios/ios_sdk.gni

-# Copyright 2015 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.
-
-declare_args() {
-  # SDK path to use. When empty this will use the default SDK based on the
-  # value of use_ios_simulator.
-  ios_sdk_path = ""
-
-  # Set to true when targeting a simulator build on iOS. False means that the
-  # target is for running on the device. The default value is to use the
-  # Simulator except when targeting GYP's Xcode builds (for compat with the
-  # existing GYP build).
-  use_ios_simulator = true
-
-  # Version of iOS that we're targeting.
-  ios_deployment_target = "6.0"
-
-  # The iOS Code signing identity to use
-  ios_code_signing_identity = ""
-
-  # The path to the iOS device SDK.
-  ios_device_sdk_path = ""
-
-  # The path to the iOS simulator SDK.
-  ios_simulator_sdk_path = ""
-}
-
-if (ios_device_sdk_path == "") {
-  _ios_device_sdk_result =
-      exec_script("ios_sdk.py", [ "iphoneos" ], "list lines")
-  ios_device_sdk_path = _ios_device_sdk_result[0]
-}
-
-if (ios_simulator_sdk_path == "") {
-  _ios_sim_sdk_result =
-      exec_script("ios_sdk.py", [ "iphonesimulator" ], "list lines")
-  ios_simulator_sdk_path = _ios_sim_sdk_result[0]
-}
-
-# Compute default target.
-if (use_ios_simulator) {
-  ios_sdk_path = ios_simulator_sdk_path
-} else {
-  ios_sdk_path = ios_device_sdk_path
-}
-
-if (use_ios_simulator) {
-  # Always disable code signing on the simulator
-  ios_code_signing_identity = ""
-} else {
-  # If an identity is not provided, look for one on the host
-  if (ios_code_signing_identity == "") {
-    _ios_identities = exec_script("find_signing_identity.py", 
-                                  [], "list lines")
-    ios_code_signing_identity = _ios_identities[0]
-  }
-}