CHECK that URLRequestJobs are not orphaned while blocked by extensions.

net/base/layered_network_delegate.cc

Index: net/base/layered_network_delegate.cc
diff --git a/net/base/layered_network_delegate.cc b/net/base/layered_network_delegate.cc
index 58254aea952f96960ebb1898158d76e67fcfa644..f84b468732ded7a6aef5360181e821ba3fdb9ce3 100644
--- a/net/base/layered_network_delegate.cc
+++ b/net/base/layered_network_delegate.cc
@@ -166,6 +166,12 @@ void LayeredNetworkDelegate::OnURLRequestDestroyedInternal(
     URLRequest* request) {
 }
 
+void LayeredNetworkDelegate::OnURLRequestJobOrphaned(URLRequest* request) {
+  // This hook is only added to debug https://crbug.com/289715, so there is no
+  // need for a OnURLRequestJobOrphanedInternal hook.
+  nested_network_delegate_->NotifyURLRequestJobOrphaned(request);
+}
+
 void LayeredNetworkDelegate::OnPACScriptError(int line_number,
                                               const base::string16& error) {
   OnPACScriptErrorInternal(line_number, error);