Revert of 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 6f8d89a7fdf614fd478409ba5d5dadd9499fbf53..e64019c0bd98b46f0c7a544c5a09e8cd485367d4 100644
--- a/net/base/layered_network_delegate.cc
+++ b/net/base/layered_network_delegate.cc
@@ -175,12 +175,6 @@ 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);