Convert ProxyResolutionServiceProvider to use Network Service.

https://chromium-review.googlesource.com/c/chromium/src/+/1419264

atom/browser/net/resolve_proxy_helper.cc

@@ -52,7 +52,7 @@ void ResolveProxyHelper::StartPendingRequest() {
   binding_.Bind(mojo::MakeRequest(&proxy_lookup_client));
   binding_.set_connection_error_handler(
       base::BindOnce(&ResolveProxyHelper::OnProxyLookupComplete,
-                     base::Unretained(this), base::nullopt));
+                     base::Unretained(this), net::ERR_ABORTED, base::nullopt));
   content::BrowserContext::GetDefaultStoragePartition(browser_context_)
       ->GetNetworkContext()
       ->LookUpProxyForURL(pending_requests_.front().url,
@@ -60,6 +60,7 @@ void ResolveProxyHelper::StartPendingRequest() {
 }
 
 void ResolveProxyHelper::OnProxyLookupComplete(
+    int32_t net_error,
     const base::Optional<net::ProxyInfo>& proxy_info) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!pending_requests_.empty());

atom/browser/net/resolve_proxy_helper.h

@@ -54,6 +54,7 @@ class ResolveProxyHelper
 
   // network::mojom::ProxyLookupClient implementation.
   void OnProxyLookupComplete(
+      int32_t net_error,
       const base::Optional<net::ProxyInfo>& proxy_info) override;
 
   // Self-reference. Owned as long as there's an outstanding proxy lookup.