Split ios/chrome/app/startup targets to reduce dependencies.

ios/clean/chrome/app/BUILD.gn

 # 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.
 
 import("//build/config/ios/rules.gni")
 import("//build/config/mac/base_rules.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 
@@ skipping 60 matching lines @@
   sources = [
     "main.mm",
   ]
 
   deps = [
     ":app",
     "//base",
     "//components/crash/core/common",
     "//ios/chrome/app:app_internal",
     "//ios/chrome/app/startup",
+    "//ios/chrome/app/startup:startup_basic",
     "//ios/chrome/browser",
     "//ios/chrome/browser:browser_internal",
     "//ios/chrome/browser/crash_report",
     "//ios/chrome/common",
     "//third_party/google_toolbox_for_mac",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }
 
@@ skipping 19 matching lines @@
     "app_delegate.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
     ":application_state",
     "//ios/clean/chrome/app/steps",
   ]
 }