Automatically retry the following URLFetchers when the network changes:

chrome/browser/extensions/updater/extension_downloader.cc

Index: chrome/browser/extensions/updater/extension_downloader.cc
diff --git a/chrome/browser/extensions/updater/extension_downloader.cc b/chrome/browser/extensions/updater/extension_downloader.cc
index f134e87b17581e5fc4507554f535e128516b2520..95f6270dadaa6d30e0bee6e3a354f53d9978f7a8 100644
--- a/chrome/browser/extensions/updater/extension_downloader.cc
+++ b/chrome/browser/extensions/updater/extension_downloader.cc
@@ -429,6 +429,11 @@ void ExtensionDownloader::CreateManifestFetcher() {
   manifest_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                                   net::LOAD_DO_NOT_SAVE_COOKIES |
                                   net::LOAD_DISABLE_CACHE);
+  // Update checks can be interrupted if a network change is detected; this is
+  // common for the retail mode AppPack on ChromeOS. Retrying once should be
+  // enough to recover in those cases; let the fetcher retry up to 3 times
+  // just in case. http://crosbug.com/130602
+  manifest_fetcher_->SetAutomaticallyRetryOnNetworkChanges(3);
   manifest_fetcher_->Start();
 }
 
@@ -674,6 +679,7 @@ void ExtensionDownloader::CreateExtensionFetcher() {
   extension_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                                    net::LOAD_DO_NOT_SAVE_COOKIES |
                                    net::LOAD_DISABLE_CACHE);
+  extension_fetcher_->SetAutomaticallyRetryOnNetworkChanges(3);
   // Download CRX files to a temp file. The blacklist is small and will be
   // processed in memory, so it is fetched into a string.
   if (extensions_queue_.active_request()->id != kBlacklistAppID) {