[gnome-shell] extensionDownloader: Use uuid lookup method in checkForUpdates()

[Florian Müllner <fmuellner src gnome org>]

commit b4ed8a3d06e9d51fcda8c4b0450cbf7422e01161
Author: Sebastian Keller <skeller src gnome org>
Date:   Thu Nov 28 14:06:12 2019 +0100

    extensionDownloader: Use uuid lookup method in checkForUpdates()
    
    The extensions variable the code was trying to access was made private
    and turned into a map some time ago.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1958

 js/ui/extensionDownloader.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/extensionDownloader.js b/js/ui/extensionDownloader.js
index e261573ab3..4661725280 100644
--- a/js/ui/extensionDownloader.js
+++ b/js/ui/extensionDownloader.js
@@ -154,7 +154,7 @@ function updateExtension(uuid) {
 function checkForUpdates() {
     let metadatas = {};
     Main.extensionManager.getUuids().forEach(uuid => {
-        metadatas[uuid] = Main.extensionManager.extensions[uuid].metadata;
+        metadatas[uuid] = Main.extensionManager.lookup(uuid).metadata;
     });
 
     let params = { shell_version: Config.PACKAGE_VERSION,