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

content/network/network_service.h

Index: content/network/network_service.h
diff --git a/content/network/network_service.h b/content/network/network_service.h
index 754878bdc05fa9225dfd42d683b07f063ec3b989..ec165b5cfdbb4b9b9098b3091a96d1441f30adab 100644
--- a/content/network/network_service.h
+++ b/content/network/network_service.h
@@ -21,11 +21,10 @@ 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,
@@ -36,7 +35,7 @@ class NetworkService
   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_;