Massively simplify the NetworkChangeNotifier infrastructure:...

chrome/service/net/service_url_request_context.cc

Index: chrome/service/net/service_url_request_context.cc
===================================================================
--- chrome/service/net/service_url_request_context.cc	(revision 50775)
+++ chrome/service/net/service_url_request_context.cc	(working copy)
@@ -21,7 +21,7 @@
 }
 
 ServiceURLRequestContext::ServiceURLRequestContext() {
-  host_resolver_ = net::CreateSystemHostResolver(NULL);
+  host_resolver_ = net::CreateSystemHostResolver();
   DCHECK(g_service_process);
   // TODO(sanjeevr): Change CreateSystemProxyConfigService to accept a
   // MessageLoopProxy* instead of MessageLoop*.
@@ -30,13 +30,13 @@
       net::ProxyService::CreateSystemProxyConfigService(
           g_service_process->io_thread()->message_loop(),
           g_service_process->file_thread()->message_loop());
-  proxy_service_ = net::ProxyService::Create(proxy_config_service, false, this,
-                                             NULL, NULL, NULL);
+  proxy_service_ =
+      net::ProxyService::Create(proxy_config_service, false, this, NULL, NULL);
   ftp_transaction_factory_ = new net::FtpNetworkLayer(host_resolver_);
   ssl_config_service_ = new net::SSLConfigServiceDefaults;
   http_auth_handler_factory_ = net::HttpAuthHandlerFactory::CreateDefault();
   http_transaction_factory_ = new net::HttpCache(
-      net::HttpNetworkLayer::CreateFactory(NULL, host_resolver_,
+      net::HttpNetworkLayer::CreateFactory(host_resolver_,
                                            proxy_service_,
                                            ssl_config_service_,
                                            http_auth_handler_factory_,