Update from https://crrev.com/303153

net/disk_cache/simple/simple_index_file.h

 // 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.
 
 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_FILE_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_FILE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
 
   // Get index entries based on current disk context.
   virtual void LoadIndexEntries(base::Time cache_last_modified,
                                 const base::Closure& callback,
                                 SimpleIndexLoadResult* out_result);
 
   // Write the specified set of entries to disk.
   virtual void WriteToDisk(const SimpleIndex::EntrySet& entry_set,
                            uint64 cache_size,
                            const base::TimeTicks& start,
-                           bool app_on_background);
+                           bool app_on_background,
+                           const base::Closure& callback);
 
  private:
   friend class WrappedSimpleIndexFile;
 
   // Used for cache directory traversal.
   typedef base::Callback<void (const base::FilePath&)> EntryFileCallback;
 
   // When loading the entries from disk, add this many extra hash buckets to
   // prevent reallocation on the IO thread when merging in new live entries.
   static const int kExtraSizeForMerge = 512;
@@ skipping 76 matching lines @@
   static const char kIndexFileName[];
   static const char kTempIndexFileName[];
 
   DISALLOW_COPY_AND_ASSIGN(SimpleIndexFile);
 };
 
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_FILE_H_