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

content/network/network_service.cc

Index: content/network/network_service.cc
diff --git a/content/network/network_service.cc b/content/network/network_service.cc
index bd04eb80fbb9f696df3335a4c11064d252694844..e6a1880f17c5dc5cf0893e0671846d1253a9fcca 100644
--- a/content/network/network_service.cc
+++ b/content/network/network_service.cc
@@ -11,24 +11,20 @@
 
 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,