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

ios/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 144 matching lines @@
     "//components/signin/core/browser",
     "//components/suggestions",
     "//components/sync",
     "//components/url_formatter",
     "//components/web_resource",
     "//ios/chrome/app/application_delegate",
     "//ios/chrome/app/application_delegate:application_delegate_internal",
     "//ios/chrome/app/safe_mode",
     "//ios/chrome/app/spotlight",
     "//ios/chrome/app/startup",
+    "//ios/chrome/app/startup:startup_basic",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser",
     "//ios/chrome/browser:browser_internal",
     "//ios/chrome/browser/bookmarks",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/browser_state:browser_state_impl",
     "//ios/chrome/browser/browsing_data",
     "//ios/chrome/browser/browsing_data:browsing_data_internal",
     "//ios/chrome/browser/content_settings",
     "//ios/chrome/browser/crash_report",
@@ skipping 70 matching lines @@
 
 source_set("main") {
   sources = [
     "chrome_exe_main.mm",
   ]
 
   deps = [
     ":app_internal",
     "//base",
     "//components/crash/core/common",
-    "//ios/chrome/app/startup",
+    "//ios/chrome/app/startup:startup_basic",
     "//ios/chrome/browser:browser_internal",
     "//ios/chrome/browser/crash_report",
     "//ios/chrome/common",
     "//third_party/google_toolbox_for_mac",
   ]
 }
 
 ios_app_bundle("chrome") {
   output_name = chromium_short_name
 
@@ skipping 78 matching lines @@
       ]
       sources = [
         "$root_out_dir/share_extension.appex",
       ]
       outputs = [
         "{{bundle_plugins_dir}}/{{source_file_part}}",
       ]
     }
   }
 }