Introduce ERR_NETWORK_CHANGED and allow URLFetcher to automatically retry on that error.

chrome/service/cloud_print/cloud_print_url_fetcher.cc

Index: chrome/service/cloud_print/cloud_print_url_fetcher.cc
diff --git a/chrome/service/cloud_print/cloud_print_url_fetcher.cc b/chrome/service/cloud_print/cloud_print_url_fetcher.cc
index da53bfbf1ea9c7e573bd6a4aaa19623abbbc7f9b..dc2a46869f733f1aac4dce371c4c4520e303c0a5 100644
--- a/chrome/service/cloud_print/cloud_print_url_fetcher.cc
+++ b/chrome/service/cloud_print/cloud_print_url_fetcher.cc
@@ -145,11 +145,11 @@ void CloudPrintURLFetcher::OnURLFetchComplete(
     // there is no reason to retry, request will never succeed.
     // In that case we should call OnRequestGiveUp() right away.
     if (source->GetResponseCode() == net::HTTP_UNSUPPORTED_MEDIA_TYPE)
-      num_retries_ = source->GetMaxRetries();
+      num_retries_ = source->GetMaxRetriesOn5xx();
 
     ++num_retries_;
-    if ((-1 != source->GetMaxRetries()) &&
-        (num_retries_ > source->GetMaxRetries())) {
+    if ((-1 != source->GetMaxRetriesOn5xx()) &&
+        (num_retries_ > source->GetMaxRetriesOn5xx())) {
       // Retry limit reached. Give up.
       delegate_->OnRequestGiveUp();
     } else {
@@ -178,7 +178,7 @@ void CloudPrintURLFetcher::StartRequestHelper(
   request_->SetRequestContext(GetRequestContextGetter());
   // Since we implement our own retry logic, disable the retry in URLFetcher.
   request_->SetAutomaticallyRetryOn5xx(false);
-  request_->SetMaxRetries(max_retries);
+  request_->SetMaxRetriesOn5xx(max_retries);
   delegate_ = delegate;
   SetupRequestHeaders();
   request_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |