Make gaia and oauth token fetchers recover from ERR_NETWORK_CHANGED.

google_apis/gaia/oauth2_access_token_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 "google_apis/gaia/oauth2_access_token_fetcher.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 51 matching lines @@
                                  URLFetcherDelegate* delegate) {
   bool empty_body = body.empty();
   URLFetcher* result = net::URLFetcher::Create(
       0, url,
       empty_body ? URLFetcher::GET : URLFetcher::POST,
       delegate);
 
   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);
 
   return result;
 }
 }  // namespace
 
 OAuth2AccessTokenFetcher::OAuth2AccessTokenFetcher(
     OAuth2AccessTokenConsumer* consumer,
@@ skipping 127 matching lines @@
   std::string data;
   source->GetResponseAsString(&data);
   scoped_ptr<base::Value> value(base::JSONReader::Read(data));
   if (!value.get() || value->GetType() != base::Value::TYPE_DICTIONARY)
     return false;
 
   DictionaryValue* dict = static_cast<DictionaryValue*>(value.get());
   return dict->GetString(kAccessTokenKey, access_token) &&
       dict->GetInteger(kExpiresInKey, expires_in);
 }