Delay NetworkService init until SetClient

This behavior was unintentionally broken by https://crrev.com/91216c0f

Bug: 1014220
Change-Id: Ibf2e961c4d98987fc24b6e028b81f8ac89b4fe94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860477Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#706691}

content/utility/services.cc

@@ -24,8 +24,9 @@ auto RunNetworkService(
     mojo::PendingReceiver<network::mojom::NetworkService> receiver) {
   auto binders = std::make_unique<service_manager::BinderRegistry>();
   GetContentClient()->utility()->RegisterNetworkBinders(binders.get());
-  return std::make_unique<network::NetworkService>(std::move(binders),
-                                                   std::move(receiver));
+  return std::make_unique<network::NetworkService>(
+      std::move(binders), std::move(receiver),
+      /*delay_initialization_until_set_client=*/true);
 }
 
 auto RunVideoCapture(