Make gaia and oauth token fetchers recover from ERR_NETWORK_CHANGED.

google_apis/gaia/oauth2_revocation_fetcher.cc

Index: google_apis/gaia/oauth2_revocation_fetcher.cc
diff --git a/google_apis/gaia/oauth2_revocation_fetcher.cc b/google_apis/gaia/oauth2_revocation_fetcher.cc
index 2a4bae54a7cdb081d7a0f0322cdab694484c2511..f5c7df12e6db9073bbc1ffd05d807e670f8cd537 100644
--- a/google_apis/gaia/oauth2_revocation_fetcher.cc
+++ b/google_apis/gaia/oauth2_revocation_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 (!header.empty())
     result->SetExtraRequestHeaders(header);