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

chrome/browser/extensions/extension_updater.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/logging.h"
@@ skipping 141 matching lines @@
 }
 
 }  // namespace
 
 ManifestFetchesBuilder::ManifestFetchesBuilder(
     ExtensionUpdateService* service) : service_(service) {
   DCHECK(service_);
 }
 
 void ManifestFetchesBuilder::AddExtension(const Extension& extension) {
+  // Skip extensions with empty update URLs converted from user
+  // scripts.
+  if (extension.converted_from_user_script() &&
+      extension.update_url().is_empty()) {
+    return;
+  }
+
   AddExtensionData(extension.location(),
                    extension.id(),
                    *extension.version(),
                    extension.is_theme(),
                    extension.update_url());
 }
 
 void ManifestFetchesBuilder::AddPendingExtension(
     const std::string& id,
     const PendingExtensionInfo& info) {
@@ skipping 663 matching lines @@
     extension_fetcher_.reset(
         URLFetcher::Create(kExtensionFetcherId, url, URLFetcher::GET, this));
     extension_fetcher_->set_request_context(
         Profile::GetDefaultRequestContext());
     extension_fetcher_->set_load_flags(net::LOAD_DO_NOT_SEND_COOKIES |
                                        net::LOAD_DO_NOT_SAVE_COOKIES);
     extension_fetcher_->Start();
     current_extension_fetch_ = ExtensionFetch(id, url, hash, version);
   }
 }