Apply the network changed retry

components/google/core/browser/google_url_tracker.cc

 // Copyright 2014 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 "components/google/core/browser/google_url_tracker.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
@@ skipping 228 matching lines @@
   already_fetched_ = true;
   fetcher_.reset(net::URLFetcher::Create(
       fetcher_id_, GURL(kSearchDomainCheckURL), net::URLFetcher::GET, this));
   ++fetcher_id_;
   // We don't want this fetch to set new entries in the cache or cookies, lest
   // we alarm the user.
   fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
   fetcher_->SetRequestContext(client_->GetRequestContext());
 
-  // Configure to max_retries at most kMaxRetries times for 5xx errors.
+  // Configure to retry at most kMaxRetries times for 5xx errors.
   static const int kMaxRetries = 5;
   fetcher_->SetMaxRetriesOn5xx(kMaxRetries);
 
+  // Also retry kMaxRetries times on network change errors. A network change can
+  // propagate through Chrome in various stages, so it's possible for this code
+  // to be reached via OnNetworkChanged(), and then have the fetch we kick off
+  // be canceled due to e.g. the DNS server changing at a later time. In general
+  // it's not possible to ensure that by the time we reach here any requests we
+  // start won't be canceled in this fashion, so retrying is the best we can do.
+  fetcher_->SetAutomaticallyRetryOnNetworkChanges(kMaxRetries);
+
   fetcher_->Start();
 }
 
 void GoogleURLTracker::OnNavigationPending(
     scoped_ptr<GoogleURLTrackerNavigationHelper> nav_helper,
     infobars::InfoBarManager* infobar_manager,
     int pending_id) {
   GoogleURLTrackerMapEntry* map_entry = NULL;
 
   EntryMap::iterator i(entry_map_.find(infobar_manager));
@@ skipping 135 matching lines @@
   }
   if (client_->IsListeningForNavigationStart()) {
     DCHECK(!search_committed_);
     client_->SetListeningForNavigationStart(false);
   }
 }
 
 void GoogleURLTracker::NotifyGoogleURLUpdated() {
   callback_list_.Notify();
 }