Revert of CHECK that URLRequestJobs are not orphaned while blocked by extensions.

net/base/network_delegate_impl.cc

Index: net/base/network_delegate_impl.cc
diff --git a/net/base/network_delegate_impl.cc b/net/base/network_delegate_impl.cc
index b5822a169634fce77dcfbf72c1cd0934ec43f548..7548f6168b5172907a4c8bd9acf724395f0767bf 100644
--- a/net/base/network_delegate_impl.cc
+++ b/net/base/network_delegate_impl.cc
@@ -68,8 +68,6 @@ void NetworkDelegateImpl::OnCompleted(URLRequest* request, bool started) {
 void NetworkDelegateImpl::OnURLRequestDestroyed(URLRequest* request) {
 }
 
-void NetworkDelegateImpl::OnURLRequestJobOrphaned(URLRequest* request) {}
-
 void NetworkDelegateImpl::OnPACScriptError(int line_number,
                                            const base::string16& error) {
 }