Add LOG call when restarting a crashed network service.

I'm investigating a failing test, and one possible reason it could be
failing is an unexpectedly crashing network process. It also seems like
this is a significant enough event to be worth unconditionally logging,
as it could cause other unexpected behaviors as well.

Bug: 1042354
Change-Id: I2fb2ea8e7c96c0b96b1925cc39f7b02a9a4e3bbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031545Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737272}

content/browser/network_service_instance_impl.cc

@@ -239,6 +239,7 @@ network::mojom::NetworkService* GetNetworkService() {
   static NetworkServiceClient* g_client;
   if (!g_network_service_remote->is_bound() ||
       !g_network_service_remote->is_connected()) {
+    bool service_was_bound = g_network_service_remote->is_bound();
     g_network_service_remote->reset();
     if (GetContentClient()->browser()->IsShuttingDown()) {
       // This happens at system shutdown, since in other scenarios the network
@@ -257,6 +258,8 @@ network::mojom::NetworkService* GetNetworkService() {
         if (IsInProcessNetworkService()) {
           CreateInProcessNetworkService(std::move(receiver));
         } else {
+          if (service_was_bound)
+            LOG(ERROR) << "Network service crashed, restarting service.";
           ServiceProcessHost::Launch(
               std::move(receiver),
               ServiceProcessHost::Options()