Sync the browser test host resolver with the network process before a test runs.

content/network/network_service.cc

 // Copyright 2017 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.
 
 #include "content/network/network_service.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "content/network/network_service_url_loader_factory_impl.h"
 #include "services/service_manager/public/cpp/service_info.h"
 
 namespace content {
 
-NetworkService::NetworkService() {
-  registry_.AddInterface<mojom::URLLoaderFactory>(this);
+NetworkService::NetworkService(
+    std::unique_ptr<service_manager::BinderRegistry> registry)
+    : registry_(std::move(registry)) {
+  registry_->AddInterface<mojom::URLLoaderFactory>(this);
 }
 
 NetworkService::~NetworkService() = default;
 
-// static
-std::unique_ptr<service_manager::Service>
-NetworkService::CreateNetworkService() {
-  return base::MakeUnique<NetworkService>();
-}
-
 void NetworkService::OnBindInterface(
     const service_manager::ServiceInfo& source_info,
     const std::string& interface_name,
     mojo::ScopedMessagePipeHandle interface_pipe) {
-  registry_.BindInterface(source_info.identity, interface_name,
-                          std::move(interface_pipe));
+  registry_->BindInterface(source_info.identity, interface_name,
+                           std::move(interface_pipe));
 }
 
 void NetworkService::Create(const service_manager::Identity& remote_identity,
                             mojom::URLLoaderFactoryRequest request) {
   loader_factory_bindings_.AddBinding(
       base::MakeUnique<NetworkServiceURLLoaderFactoryImpl>(&context_),
       std::move(request));
 }
 
 }  // namespace content