chromeos: Simplify D-Bus proxy provider (but not tests).

chromeos/dbus/services/proxy_resolution_service_provider.cc

Index: chromeos/dbus/services/proxy_resolution_service_provider.cc
diff --git a/chromeos/dbus/services/proxy_resolution_service_provider.cc b/chromeos/dbus/services/proxy_resolution_service_provider.cc
index 64bcd47884bc015156467a7596ea297458d41465..87279d6057c2a286d989e84a219181d0e8464d4d 100644
--- a/chromeos/dbus/services/proxy_resolution_service_provider.cc
+++ b/chromeos/dbus/services/proxy_resolution_service_provider.cc
@@ -16,6 +16,7 @@
 #include "net/base/net_errors.h"
 #include "net/log/net_log_with_source.h"
 #include "net/proxy/proxy_info.h"
+#include "net/proxy/proxy_service.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
@@ -198,9 +199,9 @@ void ProxyResolutionServiceProvider::ResolveProxyOnNetworkThread(
 
   VLOG(1) << "Starting network proxy resolution for "
           << request_ptr->source_url;
-  const int result =
-      delegate_->ResolveProxy(proxy_service, GURL(request_ptr->source_url),
-                              &request_ptr->proxy_info, callback);
+  const int result = proxy_service->ResolveProxy(
+      GURL(request_ptr->source_url), std::string(), &request_ptr->proxy_info,
+      callback, nullptr, nullptr, net::NetLogWithSource());
   if (result != net::ERR_IO_PENDING) {
     VLOG(1) << "Network proxy resolution completed synchronously.";
     callback.Run(result);