Update from https://crrev.com/303153

net/disk_cache/simple/simple_index.cc

 // Copyright (c) 2013 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 "net/disk_cache/simple/simple_index.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 452 matching lines @@
                        start - last_write_to_disk_);
     } else {
       SIMPLE_CACHE_UMA(MEDIUM_TIMES,
                        "IndexWriteInterval.Foreground", cache_type_,
                        start - last_write_to_disk_);
     }
   }
   last_write_to_disk_ = start;
 
   index_file_->WriteToDisk(entries_set_, cache_size_,
-                           start, app_on_background_);
+                           start, app_on_background_, base::Closure());
 }
 
 }  // namespace disk_cache