CHECK that URLRequestJobs are not orphaned while blocked by extensions.

extensions/browser/api/web_request/web_request_api.h

Index: extensions/browser/api/web_request/web_request_api.h
diff --git a/extensions/browser/api/web_request/web_request_api.h b/extensions/browser/api/web_request/web_request_api.h
index 2b262aab779c3421ca0134c4e6097cabbbdbc7d4..958bf42848c49696b4fc573132cf47409205a2b4 100644
--- a/extensions/browser/api/web_request/web_request_api.h
+++ b/extensions/browser/api/web_request/web_request_api.h
@@ -261,6 +261,10 @@ class ExtensionWebRequestEventRouter
   void OnURLRequestDestroyed(void* browser_context,
                              const net::URLRequest* request);
 
+  // See https://crbug.com/289715.
+  void OnURLRequestJobOrphaned(void* browser_context,
+                               const net::URLRequest* request);
+
   // Called when an event listener handles a blocking event and responds.
   void OnEventHandled(void* browser_context,
                       const std::string& extension_id,