Abort sync cycles when download step fails

sync/sessions/status_controller.h

Index: sync/sessions/status_controller.h
diff --git a/sync/sessions/status_controller.h b/sync/sessions/status_controller.h
index c2a3cfc7a52598ef587bd2057b18c91854f51c36..112a937b1305d1948b88870a0177e3e0725d4b53 100644
--- a/sync/sessions/status_controller.h
+++ b/sync/sessions/status_controller.h
@@ -172,20 +172,11 @@ class StatusController {
         shared_.commit_set.HasBookmarkCommitId();
   }
 
-  // Returns true if the last download_updates_command received a valid
-  // server response.
-  bool download_updates_succeeded() const {
-    return updates_response().has_get_updates();
+  // Returns the status returned from last download updates command.
+  SyncerError last_download_updates_result() const {
+    return shared_.error.value().last_download_updates_result;
   }
 
-  // Returns true if the last updates response indicated that we were fully
-  // up to date.  This is subtle: if it's false, it could either mean that
-  // the server said there WAS more to download, or it could mean that we
-  // were unable to reach the server.  If we didn't request every enabled
-  // datatype, then we can't say for sure that there's nothing left to
-  // download: in that case, this also returns false.
-  bool ServerSaysNothingMoreToDownload() const;
-
   ModelSafeGroup group_restriction() const {
     return group_restriction_;
   }