Bug 1452417 - Hold a ref to mRequest in PACResolver::Notify. r=bagder

MozReview-Commit-ID: 1QeFlAiTCNt

netwerk/base/ProxyAutoConfig.cpp

@@ -307,8 +307,9 @@ public:
   // nsITimerCallback
   NS_IMETHOD Notify(nsITimer *timer) override
   {
-    if (mRequest)
-      mRequest->Cancel(NS_ERROR_NET_TIMEOUT);
+    nsCOMPtr<nsICancelable> request(mRequest);
+    if (request)
+      request->Cancel(NS_ERROR_NET_TIMEOUT);
     mTimer = nullptr;
     return NS_OK;
   }