Revert of 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 231a6467ade43178ba9d8d0906f5dd72747ebfae..7e9db650b10bb33e4155d2950afe81b8d2230f6c 100644
--- a/net/base/network_delegate_impl.h
+++ b/net/base/network_delegate_impl.h
@@ -147,13 +147,6 @@ 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;