Added unpacking step

chrome/installer/mac/app/BUILD.gn

Index: chrome/installer/mac/app/BUILD.gn
diff --git a/chrome/installer/mac/app/BUILD.gn b/chrome/installer/mac/app/BUILD.gn
index d535005c3d4bf6bde656d2c302d2850a61bc8ae8..881fd001c5d645eee1fa95482b5a959d6ed8f625 100644
--- a/chrome/installer/mac/app/BUILD.gn
+++ b/chrome/installer/mac/app/BUILD.gn
@@ -14,6 +14,7 @@ source_set("mac_installer_base") {
     "OmahaXMLParser.m",
     "OmahaXMLRequest.m",
     "SystemInfo.m",
+    "Unpacker.m",
   ]
 }
 
@@ -32,8 +33,8 @@ mac_app_bundle("mac_installer_app") {
   ]
 
   libs = [
-    "AppKit.framework",
-    "CoreFoundation.framework",
+    "Cocoa.framework",
+    "DiskArbitration.framework",
   ]
 }
 
@@ -47,6 +48,7 @@ test("mac_installer_unittests") {
   sources = [
     "testing/OmahaXMLRequest_test.mm",
     "testing/SystemInfo_test.mm",
+    "testing/Unpacker_test.mm",
   ]
   deps = [
     ":mac_installer_base",
@@ -54,7 +56,10 @@ test("mac_installer_unittests") {
     "//base/test:run_all_unittests",
     "//testing/gtest:gtest",
   ]
-  libs = [ "Foundation.framework" ]
+  libs = [
+    "Cocoa.framework",
+    "DiskArbitration.framework",
+  ]
   data = [
     "testing/requestCheck.dtd",
     "testing/requestSample.xml",