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

content/network/network_service.h

 // 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.
 
 #ifndef CONTENT_NETWORK_NETWORK_SERVICE_H_
 #define CONTENT_NETWORK_NETWORK_SERVICE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "content/common/url_loader_factory.mojom.h"
 #include "content/network/network_context.h"
 #include "mojo/public/cpp/bindings/strong_binding_set.h"
 #include "services/service_manager/public/cpp/binder_registry.h"
 #include "services/service_manager/public/cpp/interface_factory.h"
 #include "services/service_manager/public/cpp/service.h"
 
 namespace content {
 
 class NetworkService
     : public service_manager::Service,
       public service_manager::InterfaceFactory<mojom::URLLoaderFactory> {
  public:
-  NetworkService();
+  explicit NetworkService(
+      std::unique_ptr<service_manager::BinderRegistry> registry);
   ~NetworkService() override;
 
-  static std::unique_ptr<service_manager::Service> CreateNetworkService();
-
  private:
   // service_manager::Service implementation.
   void OnBindInterface(const service_manager::ServiceInfo& source_info,
                        const std::string& interface_name,
                        mojo::ScopedMessagePipeHandle interface_pipe) override;
 
   // service_manager::InterfaceFactory<mojom::UrlLoaderFactory>:
   void Create(const service_manager::Identity& remote_identity,
               mojom::URLLoaderFactoryRequest request) override;
 
-  service_manager::BinderRegistry registry_;
+  std::unique_ptr<service_manager::BinderRegistry> registry_;
 
   NetworkContext context_;
 
   // Put it below |context_| so that |context_| outlives all the
   // NetworkServiceURLLoaderFactoryImpl instances.
   mojo::StrongBindingSet<mojom::URLLoaderFactory> loader_factory_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_NETWORK_NETWORK_SERVICE_H_