Revert of Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext

chrome/browser/profiles/off_the_record_profile_io_data.cc

Index: chrome/browser/profiles/off_the_record_profile_io_data.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_io_data.cc b/chrome/browser/profiles/off_the_record_profile_io_data.cc
index d75015105e3d77c124255ff03f16aa3c7ef4e614..9a2760ad9f10956d421fa08d308626b6def27633 100644
--- a/chrome/browser/profiles/off_the_record_profile_io_data.cc
+++ b/chrome/browser/profiles/off_the_record_profile_io_data.cc
@@ -192,6 +192,7 @@
 }
 
 void OffTheRecordProfileIOData::InitializeInternal(
+    std::unique_ptr<ChromeNetworkDelegate> chrome_network_delegate,
     ProfileParams* profile_params,
     content::ProtocolHandlerMap* protocol_handlers,
     content::URLRequestInterceptorScopedVector request_interceptors) const {
@@ -212,6 +213,11 @@
 
   main_context->set_net_log(io_thread->net_log());
 
+  main_context_storage->set_network_delegate(
+      std::move(chrome_network_delegate));
+
+  main_context->set_host_resolver(
+      io_thread_globals->host_resolver.get());
   main_context->set_http_auth_handler_factory(
       io_thread_globals->http_auth_handler_factory.get());
   main_context->set_proxy_service(proxy_service());