Added unpacking step

chrome/installer/mac/app/BUILD.gn

 # Copyright 2016 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.
 
 import("//testing/test.gni")
 
 static_library("mac_installer_base") {
   sources = [
     "Downloader.m",
     "MainDelegate.m",
     "NetworkCommunication.m",
     "OmahaCommunication.m",
     "OmahaXMLParser.m",
     "OmahaXMLRequest.m",
     "SystemInfo.m",
+    "Unpacker.m",
   ]
 }
 
 executable("mac_installer") {
   sources = [
     "main.m",
   ]
   deps = [
     ":mac_installer_base",
   ]
-  libs = [ "Foundation.framework" ]
+  libs = [
+    "CoreFoundation.framework",
+    "DiskArbitration.framework",
+    "Foundation.framework",
+  ]
 }
 
 test("mac_installer_test") {
   sources = [
     "testing/OmahaXMLRequest_test.mm",
     "testing/SystemInfo_test.mm",
   ]
   deps = [
     ":mac_installer_base",
     "//base:base",
     "//base/test:run_all_unittests",
     "//testing/gtest:gtest",
   ]
   libs = [ "Foundation.framework" ]
 }