Apply the network changed retry

components/google/core/browser/google_url_tracker.cc

Index: components/google/core/browser/google_url_tracker.cc
diff --git a/components/google/core/browser/google_url_tracker.cc b/components/google/core/browser/google_url_tracker.cc
index 0c27a436064dc0050bae50bcae53e36dd2b9f6d0..be9296be696573021940438f0a60660892930e6e 100644
--- a/components/google/core/browser/google_url_tracker.cc
+++ b/components/google/core/browser/google_url_tracker.cc
@@ -246,10 +246,18 @@ void GoogleURLTracker::StartFetchIfDesirable() {
                          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();
 }