Automatically retry the following URLFetchers when the network changes:

chrome/browser/net/gaia/gaia_oauth_fetcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/net/gaia/gaia_oauth_fetcher.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 45 matching lines @@
     const std::string& body,
     const std::string& headers,
     bool send_cookies,
     net::URLFetcherDelegate* delegate) {
   bool empty_body = body.empty();
   net::URLFetcher* result = net::URLFetcher::Create(
       0, gaia_gurl,
       empty_body ? net::URLFetcher::GET : net::URLFetcher::POST,
       delegate);
   result->SetRequestContext(getter);
+  // 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);
 
   // The Gaia/OAuth token exchange requests do not require any cookie-based
   // identification as part of requests.  We suppress sending any cookies to
   // maintain a separation between the user's browsing and Chrome's internal
   // services.  Where such mixing is desired (prelogin, autologin
   // or chromeos login), it will be done explicitly.
   if (!send_cookies)
     result->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES);
 
   if (!empty_body)
@@ skipping 476 matching lines @@
       break;
     case OAUTH2_REVOKE_TOKEN:
       OnOAuthRevokeTokenFetched(data, status, response_code);
       break;
   }
 }
 
 bool GaiaOAuthFetcher::ShouldAutoFetch(RequestType fetch_step) {
   return fetch_step <= auto_fetch_limit_;
 }