Make gaia and oauth token fetchers recover from ERR_NETWORK_CHANGED.

google_apis/gaia/oauth2_mint_token_fetcher.cc

Index: google_apis/gaia/oauth2_mint_token_fetcher.cc
diff --git a/google_apis/gaia/oauth2_mint_token_fetcher.cc b/google_apis/gaia/oauth2_mint_token_fetcher.cc
index 425a12649915ed476dc495f4c3b68d3ab45a804d..051f9ab49bb9c01a77aa31bffbd598f64e4d7947 100644
--- a/google_apis/gaia/oauth2_mint_token_fetcher.cc
+++ b/google_apis/gaia/oauth2_mint_token_fetcher.cc
@@ -62,6 +62,11 @@ static URLFetcher* CreateFetcher(URLRequestContextGetter* getter,
   result->SetRequestContext(getter);
   result->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                        net::LOAD_DO_NOT_SAVE_COOKIES);
+  // Fetchers are sometimes cancelled because a network change was detected,
+  // especially at startup and after sign-in on ChromeOS. Retrying once should
+  // be enough in those cases; let the fetcher retry up to 3 times just in case.
+  // http://crbug.com/163710
+  result->SetAutomaticallyRetryOnNetworkChanges(3);
 
   if (!empty_body)
     result->SetUploadData("application/x-www-form-urlencoded", body);