Try to speed up SimpleCache index re-sync on Windows.

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 <stdint.h>
 
 #include <memory>
@@ skipping 87 matching lines @@
                            const SimpleIndex::EntrySet& entry_set,
                            uint64_t cache_size,
                            const base::TimeTicks& start,
                            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;
+  using EntryFileCallback = base::Callback<void(const base::FilePath&,
+                                                base::Time last_accessed,
+                                                base::Time last_modified,
+                                                int64_t size)>;
 
   // 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;
 
   // Synchronous (IO performing) implementation of LoadIndexEntries.
   static void SyncLoadIndexEntries(net::CacheType cache_type,
                                    base::Time cache_last_modified,
                                    const base::FilePath& cache_directory,
                                    const base::FilePath& index_file_path,
@@ skipping 72 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_