CHECK that URLRequestJobs are not orphaned while blocked by extensions.

net/base/network_delegate_impl.h

Index: net/base/network_delegate_impl.h
diff --git a/net/base/network_delegate_impl.h b/net/base/network_delegate_impl.h
index 7a2318899396d99f87e537fa9346838016ddd447..84e898d2a636e4d1c560b9de25908ee326091ed4 100644
--- a/net/base/network_delegate_impl.h
+++ b/net/base/network_delegate_impl.h
@@ -138,6 +138,13 @@ class NET_EXPORT NetworkDelegateImpl : public NetworkDelegate {
   // a virtual method call.
   void OnURLRequestDestroyed(URLRequest* request) override;
 
+  // Called when the current job for |request| is orphaned. This is a temporary
+  // callback to diagnose https://crbug.com/289715 and may not be used for other
+  // purposes. Note that it may be called after OnURLRequestDestroyed.
+  //
+  // TODO(davidben): Remove this once data has been gathered.
+  void OnURLRequestJobOrphaned(URLRequest* request) override;
+
   // Corresponds to ProxyResolverJSBindings::OnError.
   void OnPACScriptError(int line_number, const base::string16& error) override;