[Extensions] Make port creation synchronous in unload handlers

extensions/renderer/extension_frame_helper.h

Index: extensions/renderer/extension_frame_helper.h
diff --git a/extensions/renderer/extension_frame_helper.h b/extensions/renderer/extension_frame_helper.h
index 5a22d9a7cc2989b76c96932205358d0a9afee9d6..084738c4e71144a47f0ae054044d4fddf0fb5c1c 100644
--- a/extensions/renderer/extension_frame_helper.h
+++ b/extensions/renderer/extension_frame_helper.h
@@ -94,6 +94,9 @@ class ExtensionFrameHelper
                         const base::Callback<void(int)>& callback);
   void RequestNativeAppPortId(const std::string& native_app_name,
                               const base::Callback<void(int)>& callback);
+  int RequestSyncPortId(const ExtensionMsg_ExternalConnectionInfo& info,
+                        const std::string& channel_name,
+                        bool include_tls_channel_id);
 
  private:
   struct PendingPortRequest;