Check for updates for a user script only if it has an update URL.

chrome/browser/extensions/extension_updater_unittest.cc

Index: chrome/browser/extensions/extension_updater_unittest.cc
diff --git a/chrome/browser/extensions/extension_updater_unittest.cc b/chrome/browser/extensions/extension_updater_unittest.cc
index 0895501ff0df04037c0960d9824d3fd81f9b943d..416a39535712977c93977bb30b9e3d94a132d071 100644
--- a/chrome/browser/extensions/extension_updater_unittest.cc
+++ b/chrome/browser/extensions/extension_updater_unittest.cc
@@ -891,6 +891,9 @@ TEST(ExtensionUpdaterTest, TestManifestFetchesBuilderAddExtension) {
       "", PendingExtensionInfo(GURL(), false, false, true, false));
   EXPECT_TRUE(builder.GetFetches().empty());
 
+  // TODO(akalin): Test that extensions with empty update URLs
+  // converted from user scripts are rejected.
+
   // Extensions with empty update URLs should have a default one
   // filled in.
   builder.AddPendingExtension(