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

net/url_request/test_url_fetcher_factory.cc

Index: net/url_request/test_url_fetcher_factory.cc
diff --git a/net/url_request/test_url_fetcher_factory.cc b/net/url_request/test_url_fetcher_factory.cc
index 967b810bd3322f2669a9f69e1d95f415e5d929e0..08ba483b23a01d29811999120a0c365104a9f561 100644
--- a/net/url_request/test_url_fetcher_factory.cc
+++ b/net/url_request/test_url_fetcher_factory.cc
@@ -114,11 +114,11 @@ void TestURLFetcher::SetStopOnRedirect(bool stop_on_redirect) {
 void TestURLFetcher::SetAutomaticallyRetryOn5xx(bool retry) {
 }
 
-void TestURLFetcher::SetMaxRetries(int max_retries) {
+void TestURLFetcher::SetMaxRetriesOn5xx(int max_retries) {
   fake_max_retries_ = max_retries;
 }
 
-int TestURLFetcher::GetMaxRetries() const {
+int TestURLFetcher::GetMaxRetriesOn5xx() const {
   return fake_max_retries_;
 }
 
@@ -126,6 +126,9 @@ base::TimeDelta TestURLFetcher::GetBackoffDelay() const {
   return fake_backoff_delay_;
 }
 
+void TestURLFetcher::SetAutomaticallyRetryOnNetworkChanges(int max_retries) {
+}
+
 void TestURLFetcher::SaveResponseToFileAtPath(
     const FilePath& file_path,
     scoped_refptr<base::TaskRunner> file_task_runner) {